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3a - 2 = 4b
3a = 4b + 2
a = (4b + 2)/3
a + b = 24
(4b + 2)/3 + b = 24
(4b + 2 + 3b)/3 = 24
7b + 2 = 72
7b = 72 - 2
7b = 70
b = 10
a + b = 24
a + 10 = 24
a = 14