Question

-3(2x+7)+(-5x+6)-8(1-2x)-(x-3)=0

Answer 1

-3(2x+7)+(-5x+6)-8(1-2x)-(x-3)=0

-3 (2x + 7) - 5x + 6 - 8 (-2x + 1) - x + 3 =0

-3 (2x + 7) - 6x - 8 (-2x + 1) + 9 = 0

- (3 . 2x + 3 . 7) - 6x - (-8 . 2x + 8) + 9 = 0

- (6x + 21) - 6x - (-16x + 8) + 9 = 0

-6x - 21 - 6x + 16x - 8 + 9 = 0

4x - 20 = 0

4x = 20

x = 20/4

x = 5

Respuesta : 

x = 5

Answer 2

Resolver.

- 3( 2x + 7) + ( - 5x + 6) - 8( 1 - 2x) - (x - 3) = 0
-6x - 21 - 5x + 6 - 8 + 16x - x + 3 = 0
(- 6x - 5x + 16x - x ) + ( - 21 + 6 - 8 + 3) =
(16x - 12x) + (-29 + 9) = 0
4x - 20 = 0
4x = 20
x = 20/4
x = 5

Respuesta.
x = 5

Para quitar parentesis se utilizo ley de signos
+  por  + =  +
-  por  -  =  +
+  por  -  = -
-  por  + =  -