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(3/4)*x-6 = (7/8)*x // - (7/8)*x
(3/4)*x-((7/8)*x)-6 = 0
(3/4)*x+(-7/8)*x-6 = 0
-1/8*x-6 = 0 // + 6
-1/8*x = 6 // : -1/8
x = 6/(-1/8)
x = -48
x = -48
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