8 + x = 5
x + 5 = 8
x = 3
x + 9 = 9
10 + x = 3
x + 3 = 9
p + 2 = 7
6 + x = 6
x = -3
x — 50 = 40
x + 2 = 7
x = 5
x + 11 = 0
x + 7 = 20
x = 13