1) 2.(5 + 3x) + x = 31
10 + 6x + x = 31
10 + 7x = 31
7x = 31 - 10
7x = 21
x = 3
2) (3x - 7) + 2(5 - 2x) + 5x = 19
3x - 7 + 2(5 - 2x) + 5x = 19
8x - 7 + 10 - 4x = 19
4x + 3 = 19
4x = 19 - 3
4x = 16
x = 4
1) 2.(5 + 3x) + x = 31
10 + 6x + x = 31
10 + 7x = 31
7x = 31 - 10
7x = 21
x = 3
2) (3x - 7) + 2(5 - 2x) + 5x = 19
3x - 7 + 2(5 - 2x) + 5x = 19
8x - 7 + 10 - 4x = 19
4x + 3 = 19
4x = 19 - 3
4x = 16
x = 4
tìm các số nguyên x biết:
a) 2.(5+3.x)+x=31
b) (3x-7)+2.(5-2x)+5x=19
tim x số nguyên bt
a. (-12).x=(15).(-4)-12
b.(-5).x+5=(-3).(-8)+6
c.2.(5+3x)+x=31
d.(3x-7)+2.(5-2x)+5x=19
tìm x
(3x-7)+2.(5-2x)+5x=19
5/2+x=-3,5
-2x+5=23
x/21=2/7-4/3
5/3x-2/5x=19/10
Tìm số nguyên x thỏa mãn:
(3x-7)+2.(5-2x)+5x=19.
Rút gọn biểu thức
A= -(3x+7)+(5x-2)+(2x-10)
B= (6x+8)-(4x-5)-3x
C= 2.(5x+3)-(2x-1)+12
D=(x+7)-3.(x+1)+2x-5
a) (x-12)-(2x+31) = 6
b) 2(x+7)-3(x-2)= -2
c) (3x+19) (11-x) = 0
d) x+3-3(x+5) = x-9
e) -2 (x+1) +5 (x-2) = x-14
Tìm x
A. 31x - 3x -5x +25
B. 15(x -2) + 3(5-1) = -14
C. 4x (41 -52) -35x = -(7-2x)
D. 53 -(3x -17) + 218= 19 + 45x
Tìm x:
a) 31-2(x+3)=21
b) (x-11):7+5=7
c)37+49(x-6)=45
d)153-5(x+4)=28
e) 3x+5x=16
g) 4x+5x+7=34
h) 2(x+2)+(x+2)=6
k) 2(x+2)+3x=19
l) 3(x+1)+2(x+2)=117
m) 5(x+2)+3(x+4)+18=48
GIÚP MÌNH VỚI ,MÌNH ĐANG CẦN GẤP.CẢM ƠN!