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(4/5)*x+x+5/7 = 592/35 // - 592/35
(4/5)*x+x+5/7-(592/35) = 0
(4/5)*x+x+5/7-592/35 = 0
9/5*x-81/5 = 0 // + 81/5
9/5*x = 81/5 // : 9/5
x = 81/5/9/5
x = 9
x = 9
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