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(12/35)*x-(8/7) = 4/7 // - 4/7
(12/35)*x-(8/7)-(4/7) = 0
(12/35)*x-8/7-4/7 = 0
12/35*x-12/7 = 0 // + 12/7
12/35*x = 12/7 // : 12/35
x = 12/7/12/35
x = 5
x = 5
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