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(2/7)*x-1/8 = 121/56 // - 121/56
(2/7)*x-1/8-(121/56) = 0
(2/7)*x-1/8-121/56 = 0
2/7*x-16/7 = 0 // + 16/7
2/7*x = 16/7 // : 2/7
x = 16/7/2/7
x = 8
x = 8
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