Question

Perguntas na foto, me ajudem!!!!!!

Answer 1

A)
3(x+2) = 2(x-7)+x+20
3x + 6 = 2x - 14 + x + 20
3x - 2x - x = -14 - 6 + 20
0=0
0

B)
5x - 17 = 6x + 13
5x - 6x = 13 + 17
-x= 30
x= -30

C) 
18x - 45 = -25x + 25
18x + 25x = 25 + 45
43x = 70
x = 70/43

D)
-x + 4(2-x)= -2x - (10 + 3x)
-x + 8 - 4x = -2x -10 - 3x
-5x + 3x+ 2x = -10-8
0x= -18
0