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(1/2)*x+(1/3)*x+7/1 = x // - x
(1/2)*x+(1/3)*x-x+7/1 = 0
(1/2)*x+(1/3)*x-x+7 = 0
7-1/6*x = 0 // - 7
-1/6*x = -7 // : -1/6
x = -7/(-1/6)
x = 42
x = 42
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