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(3/4)*x+7/12 = 7/8 // - 7/8
(3/4)*x+7/12-(7/8) = 0
(3/4)*x+7/12-7/8 = 0
3/4*x-7/24 = 0 // + 7/24
3/4*x = 7/24 // : 3/4
x = 7/24/3/4
x = 7/18
x = 7/18
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