Question

a) 0 = -3 - (x + 2) + 8
b) - ( x - 16) =1 +(x +3)

Answer 1

A)
0 = - 3 - (x + 2) + 8
0 = - 3 - x - 2 + 8
0 = - 5 - X + 8
0 = - X + 3
X = 3

b)
- (X - 16) = 1 + (x + 3)
- X + 16 = 1 + X + 3
- X - X = 1 + 3 - 16
- 2X = 4 - 16
- 2X = - 12 (*-1 para trocar os sinais)
2X = 12
X = 12 / 2
X = 6

Answer 2

a) 
0 = -3 - (x + 2) + 8
0 = - 3 - x - 2 + 8
x = - 3 - 2 + 8
x = - 5 + 8
x = 3
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b)
- ( x - 16) =1 + (x +3)
- x + 16 = 1 + x + 3
- x + 16 = 1 + 3 + x
- x + 16 = 4 + x
16 - 4 = x + x
12 = 2x
2x = 12
x = 12/2
x = 6