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(5/7)*x+3/8 = 421/56 // - 421/56
(5/7)*x+3/8-(421/56) = 0
(5/7)*x+3/8-421/56 = 0
5/7*x-50/7 = 0 // + 50/7
5/7*x = 50/7 // : 5/7
x = 50/7/5/7
x = 10
x = 10
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