Addition
x + 4 = 28
x - 14 = 25
x = 39
2x = 12
x = 6
x ÷ 6 = 3
x = 18
145 = x + 23
x = 122
y + 12 = 32
y = 20
c - 9 = 10
c = 19
5y = 60
y = 12
y ÷ 7 = 3
y = 21
y - 72 = 55
y = 127
8 + n = 16
n = 8
v - 15 = 15
10n = 90
n = 9
a ÷ 12 = 3
a = 36
20x = 40
x = 2
35 = x + 13
x = 22
x - 22 = 36
x = 58
56 = 8a
b ÷ 8 = 9
b = 72
22 = x ÷ 4
x = 88
108 = y + 17
y = 91
70 = x - 72
x = 142
144 = 12x
x = 12
12 = x ÷ 2
x = 24
x ÷ 3 = 42
x = 126