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(2*x)/5-(4/7) = 50/35 // - 50/35
(2*x)/5-(4/7)-(50/35) = 0
(2*x)/5-4/7-10/7 = 0
2/5*x-2 = 0 // + 2
2/5*x = 2 // : 2/5
x = 2/2/5
x = 5
x = 5
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