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3b - 4 = 2a
3b = 2a + 4
b = (2a + 4)/3
a - (2a + 4)/3 = 2
(3a - 2a + 4)/3 = 2
a + 4 = 6
a = 2
a - b = 2
2 - b = 2
2 - 2 = b
0 = b