Question

a) x - 17 = -9 n) 3. (x +2) + 5 = x + 12

Answer 1

a ) x - 17 = - 9
x = - 9 + 17
x = 8

n ) 3 . ( x + 2 ) + 5 = x + 12
3x + 6 + 5 = x + 12
3x - x = 12 - 6 - 5
2x = 1
x = 1/2

Espero ter ajudado :)