1) x + 5 = - 2
x = - 2 - 5
x = - 7
2) x - 12 = - 15
x = - 15 + 12
x = - 3
3) - 3 x = 18
x = - 18 / 3
x = - 6
4) x : ( - 2 ) = 4
x = 4 × ( - 2 )
x = - 8
5) 3 x = - 12
x = - 12 / 3
x = - 4
6) 7 x - 8 = - 22
7 x = - 22 + 8
7 x = - 14
x = - 14 / 7
x = - 2