\(x-\left\{57-\left[42+\left(-23-x\right)\right]\right\}=13-\left\{47+\left[25-\left(32-x\right)\right]\right\}\)

=>\(x-\left\{57-42+23+x\right\}=13-47-25+32-x\)

=>\(x-\left(x+38\right)=-27-x\)

=>\(-27-x=-38\)

=>x+27=38

=>\(x=38-27=11\)

\(x-\left\{57-\left[42+\left(-23-x\right)\right]\right\}=13-\left\{47+\left[25-\left(32-x\right)\right]\right\}\)

\(\Leftrightarrow x-57+42-23-x=13-47-25+32-x\)

\(\Leftrightarrow x-x-57+42-23=-27-x\)

\(\Leftrightarrow-57+42-23=-27-x\)

\(\Leftrightarrow-38=-27-x\)

\(\Leftrightarrow x=\left(-27\right)-\left(-38\right)\)

\(\Leftrightarrow x=11\)

Vậy \(x=11\) là giá trị cần tìm

\(x-\left(57-\left(42+\left(-23-x\right)\right)\right)=13-\left(47+\left(25-\left(32-x\right)\right)\right)\)

\(\Leftrightarrow\) \(x-\left(57-\left(42-23-x\right)\right)=13-\left(47+\left(25-32+x\right)\right)\)

\(\Leftrightarrow\) \(x-\left(57-42+23+x\right)=13-\left(47+25-32+x\right)\)

\(\Leftrightarrow\) \(x-57+42-23-x=13-47-25+32-x\)

\(\Leftrightarrow\) \(-38=-27-x\) \(\Leftrightarrow\) \(-x=-38+27=-11\Leftrightarrow x=11\)

vậy \(x=11\)

\(x-\left\{57-\left[42+\left(-23-x\right)\right]\right\}=13-\left\{47+\left[25-\left(32-x\right)\right]\right\}\)

\(\Leftrightarrow x-57+42-23-x=13-47-25+32-x\)

\(\Leftrightarrow x-x-57+42-23=-27-x\)

\(\Leftrightarrow-57+42-23=-27-x\)

\(\Leftrightarrow-38=-27-x\)

\(\Leftrightarrow x=-27-\left(-38\right)\)

\(\Leftrightarrow x=11\left(TM\right)\)

Vậy \(x=11\) là giá trị cần tìm

\(\Leftrightarrow\) \(x-\left(57-\left(42-23-x\right)\right)=13-\left(47+\left(25-32+x\right)\right)\)

\(\Leftrightarrow\) \(x-\left(57-42+23+x\right)=13-\left(47+25-32+x\right)\)

\(\Leftrightarrow\) \(x-57+42-23-x=13-47-25+32-x\)

\(\Leftrightarrow\) \(-38=-27-x\) \(\Leftrightarrow\) \(-x=-38+27=-11\Leftrightarrow x=11\)

vậy \(x=11\)

a 43+(9-21)=317-(x-317)

43+(-10)=317-x-317

31=(317-317)-x

31=-x

x=-31

h minh nha

 x-(57-(42+(-23-x)=13-47+25-23-x

 x-57-42-23-x=13-47+25-23-x

 x-122-x=-32-x

 x-x-122=-32-x

 -32-x=-122

        x=-32-(-122)

        x=90

 Vậy x=90

\(x-(57-(42+(-23-x)=13-47+25-13-x\)

\(\Rightarrow x-57-42+\left(-23\right)-x=13-47+25-23-x\)

\(\Rightarrow x-x+x=13-47+25-23+23+42+57\)

\(\Rightarrow x=90\)

ko ghi lại đề 

\(\Rightarrow x-57-42-23-x=13-47+25-32+x\)

\(\Rightarrow x-x+x=13-47+25-32+57+42+23\)

\(\Rightarrow x=\left(13+23\right)-\left(47+57\right)+\left(25+57\right)-\left(32+42\right)\)

\(\Rightarrow x=36-104+82-74\)

\(\Rightarrow x=-60\)

bn j ơi, bn chép sai đề gồi

phải là 43 chớ ko phải 42 ngheng bn

thì sửa thành 43 hoi rồi thay vào cách lm y hệt 

a: \(\left[\left(10-x\right)\cdot2+51\right]:3-2=3\)

=>\(\left[2\left(10-x\right)+51\right]:3=5\)

=>\(\left[2\left(10-x\right)+51\right]=15\)

=>\(2\left(10-x\right)=15-51=-36\)

=>10-x=-36/2=-18

=>\(x=10-\left(-18\right)=10+18=28\)

b: \(\left(x-12\right)-15=20-\left(17+x\right)\)

=>\(x-12-15=20-17-x\)

=>\(x-27=3-x\)

=>\(2x=30\)

=>\(x=\dfrac{30}{2}=15\)

c: \(720-\left[41-\left(2x-5\right)\right]=2^3\cdot5\)

=>\(720-\left[41-2x+5\right]=8\cdot5=40\)

=>\(\left[41-2x+5\right]=720-40=680\)

=>-2x+46=680

=>-2x=680-46=634

=>\(x=\dfrac{634}{-2}=-317\)

a, 43 + ( 9 - 21 ) = 317 - ( x + 317 )

   43 + ( -12 ) = 317 - x - 317

   43 - 12 = 317 - 317 - x

   -x = 31

   x = -31

b, (15-x) + (x-12) = 7- (-5 + x)

    15-x+x-12 = 7+5-x

     15-12 = 12-x

     3 = 12-x

     x =  12-3

     x = 9

c, x - { 57- [42+ (-23 - x)]} = 13- {47+ [25- (32-x)]}

   x - [57- (42-23-x)] = 13- [47+ (25-32+x)]

   x - [57- (19-x)] = 13- [47+ (x-7)]

   x - (57-19+x) = 13- (47+x-7)

   x - (38+x) = 13- (40+x)

   x-38-x = 13-40-x

   x = 13-40+38

   x = 11

a , 43 + ( 9 - 21 ) = 317 - ( x + 317 )

b , ( 15 - x ) + ( x - 12 ) = 7 - ( -5 + x )

c , x - { 57 - [ 42 + ( -23 - x )]} = 13 - { 47 + [ 25 - ( 32 - x )]}

d , -7 + | x - 4 | = -3