1) x = 27 - 13
x = 14
2) x = 15 - 11
x = 4
3) x = 4 - 7
x = -3
4) x = -3 -8
x = -11
5) x = 10 + 4
6) x = 11 + 7
x = 18
7) x = -2 + 4
x = 2
8) x = -22 + 7
x = -15
