\(2x+3=15\\ \Rightarrow2x=15-3=12\\ \Rightarrow x=\dfrac{12}{2}=6\\ ---\\ 28-3x=13\\ \Rightarrow3x=28-13=15\\ \Rightarrow x=\dfrac{15}{3}=5\\ ---\\ \left(x-1954\right).5=50\\ \Rightarrow x-1954=50:5=10\\ \Rightarrow x=10+1954=1964\\ ---\\ x-152:2=46\\ \Rightarrow x-76=46\\ \Rightarrow x=46+76=122\)

a, 2\(x\) + 3 = 15

     2\(x\)       = 12

        \(x\)      = 6

b, 28 - 3\(x\) = 13

           3\(x\) = 28 - 13

           3\(x\)  = 15

             \(x\)   = 5

a) 

\(2x+3=15\)

\(2x=15-3\)

\(2x=12\)

\(x=12:2\)

\(x=6\)

b) \(28-3x=13\)

\(3x=28-13\)

\(3x=15\)

\(x=15:3\)

\(x=5\)

c) \(\left(x-1954\right).5=50\)

\(x-1954=50:5\)

\(x-1954=10\)

\(x=10+1954\)

\(x-1964\)

d) \(x-152:2=46\)

\(x-152=46.2\)

\(x-152=92\)

\(x=92+152\)

\(x=244\)

\(x-152\div2=46\)

\(x-76=46\)

\(x=46+76\)

\(x=122\)

\(x-152:2=46\)

\(\Leftrightarrow x-76=46\)

\(\Leftrightarrow x=122\)

a)  x + 1 5 2 − 9 25 = 0 ⇒ x + 1 5 2 = 9 25 ⇒ x + 1 5 = 3 5 x + 1 5 = − 3 5 ⇒ x = 2 5 x = − 4 5

b)  x + 1 5 2 + 17 25 = 26 25 ⇒ x + 1 5 2 = 9 25 ⇒ x = 2 5 x = − 4 5

a ) | x | − 3 4 = 5 3 = > | x | = 29 12 = > x = 29 12 x = − 29 12

b)  x − 3 2 = 1 = > x − 3 2 = 1 x − 3 2 = − 1 = > x = 5 2 x = 1 2

c)  x − 3 2 + 11 4 = 15 4 = > x − 3 2 = 1 = > x = 5 2 x = 1 2

d)  17 4 − 5 6 − x = − 7 4 = > 5 6 − x = 6 = > x = − 31 6 x = 41 6

e)

  x + 1 5 2 − 9 25 = 0 = > x + 1 5 2 = 9 25 = > x + 1 5 = 3 5 x + 1 5 = − 3 5 = > x = 2 5 x = − 4 5

f) x + 1 5 2 + 17 25 = 26 25 = > x + 1 5 2 = 9 25 = > x = 2 5 x = − 4 5

X=0;1;2;3;4

\(152\times4+x=268+1344\\608+x=1612\\x=1612-608\\x=1004\)

152x4+

152x4+x=268+1344

152x4+x=1612

   1612-x=152x4

   1612-x=608

            x=1612-608

            x=1004

25-x=152

x=25-152

x=-127

đâu có sai Trương ánh Ngọc

25 - x = 152

       x = 25  - 152

       x =  -127

\(152:\left(4x+6:2\right)\times9=\left(-4\right)\times\left(-2\right)\\ =>152:\left(4x+3\right)\times9=8\\ =>152:\left(4x+3\right)=\dfrac{8}{9}\\ =>4x+3=152:\dfrac{8}{9}\\ =>4x+3=152\times\dfrac{9}{8}\\ =>4x+3=171\\ =>4x=171-3\\ =>4x=168\\ =>x=168:4\\ =>x=42\)

152 : (4x +3) x 9 = 8 

(4x + 3) x 9 = 19 

4x + 3 = \(\dfrac{19}{9}\)

4x = \(\dfrac{-8}{9}\)

x = \(\dfrac{-2}{9}\)

152 : (4x +3 ) x 9 = 8

152 : (4x + 3) =\(\dfrac{8}{9}\)

4x + 3 = 171 

4x = 168 

x = 42