Question

12+x=42

X-11 = 25-11 =

2X -8 = 22

Answer 1

12 + x = 42
x = 42 - 12
x = 30


x - 11 = 25 - 11
x - 11 = 14
x = 14 + 11 = 25


2x - 8 = 22
2x = 22 - 8
2x = 14
x = 14/2
x = 7

S = {7, 25, 30}

Espero ter ajudado!!!!