Question

(1) -5x=12-x
(2) 2 (x-7) -3 (x+2) +4 (x+1) -2=0
(3) 2x-1=3(x+2)-x

Answer 1

-5x=12-x 
- 5x + x = 12
- 4x = 12
x = 12/-4
x = -3


 2 (x-7) -3 (x+2) +4 (x+1) -2=0 
2x - 14 - 3x - 6 + 4x + 4 - 2 = 0
2x + 4x - 3x - 14 - 6 - 2 + 4 = 0
6x - 3x - 22 + 4 = 0
3x - 18 = 0
3x = 18
x = 18/3
x = 6



2x-1=3(x+2)-x
2x - 1 = 3x + 6 - x
2x - 1 = 2x + 6
2x - 2x = 6 + 1
0x = 7

No existe solución para esta ecuación.