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3 - (1/2)x - 1 + (1/3)x = 7 - x + (1/2)x
-(1/2)x + (1/3)x - (1/2)x + x = 7 - 3 + 1 = 5
-x + (1/3)x + x = 5
(1/3)x = 5
x = 15