12 + b = 72 ÷ 212 + b = 36b = 36 - 12b = 24
(x + 20) ÷ 5 = 6x + 20 = 6 * 5x + 20 = 30x = 30 - 20x = 10
a ÷ 10 = 960 ÷ 2a ÷ 10 = 480a = 480 * 10a = 4800
2400 ÷ (c - 12) = 102400 = 10(c - 12)2400 = 10c - 12010c = 2400 + 12010c = 2520c = 2520 ÷ 10c = 252
12 + b = 72 ÷ 2
12 + b = 36
b = 36 - 12
b = 24
(x + 20) ÷ 5 = 6
x + 20 = 6 * 5
x + 20 = 30
x = 30 - 20
x = 10
a ÷ 10 = 960 ÷ 2
a ÷ 10 = 480
a = 480 * 10
a = 4800
2400 ÷ (c - 12) = 10
2400 = 10(c - 12)
2400 = 10c - 120
10c = 2400 + 120
10c = 2520
c = 2520 ÷ 10
c = 252