addition
x+ 3 = 4
x-2 = 5
x = 7
3x=12
x = 4
x/3 = 1
x = 3
x + 4 = 10
x = 6
x - 7 = 2
x = 9
2x = 16
x = 8
x/5 = 4
x = 20
x + 8 = 16
x = 24
x - 7 = 21
x = 28
5x = 35
x = 7
x/5 = 6
x = 30
x + 14 = 30
x = 16
x - 6 = 20
x = 26
4x + 3 = 23
x = 5
x/4 = 7
x = 28
x + 19 = 24
x = 5
x - 19 = 19
x = 38
10x - 9 = 91
x = 10
x/8 = 4
x = 32