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(2*x)/7-(x/5) = 12/35 // - 12/35
(2*x)/7-(x/5)-(12/35) = 0
(2*x)/7-(x/5)-12/35 = 0
3/35*x-12/35 = 0 // + 12/35
3/35*x = 12/35 // : 3/35
x = 12/35/3/35
x = 4
x = 4
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