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(3/7)*x+5/8 = 43/56 // - 43/56
(3/7)*x+5/8-(43/56) = 0
(3/7)*x+5/8-43/56 = 0
3/7*x-1/7 = 0 // + 1/7
3/7*x = 1/7 // : 3/7
x = 1/7/3/7
x = 1/3
x = 1/3
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