Question

resolva:
a,2-x=9
b,4(x+2)= 2 (x-1)+3(x+1)
C, 3x+1+7

Answer 1

a) 2 - x = 9 -> -x = 9 - 2 -> -x = 7 (* [-1])  -> x = -7

b) 4(x+2)= 2(x-1) + 3(x+1) -> 4x + 8 = 2x - 2 + 3x + 3 -> 4x - 2x - 3x = - 2 + 3 - 8
-> -x = -7 (*[-1]) -> x = 7

c) 3x + 1 + 7 = 0 -> 3x = - 7 - 1 - > 3x = - 8 - > x = - 8/3

Answer 2

>> Ok vamos lá.

a,2-x=9
2-9 = x
x= -7

b,4(x+2)= 2 (x-1)+3(x+1)
4x+8 = 2x-2+3x+3
4x-5x = 1-8
-x = -7
x = 7

C, 3x+1+7
3x = 8
x = 8/3