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(2*x)/5+(3*x)/7 = 1 // - 1
(2*x)/5+(3*x)/7-1 = 0
29/35*x-1 = 0 // + 1
29/35*x = 1 // : 29/35
x = 1/29/35
x = 35/29
x = 35/29
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