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(9*x)/10 = 5/7 // - 5/7
(9*x)/10-(5/7) = 0
(9*x)/10-5/7 = 0
9/10*x-5/7 = 0 // + 5/7
9/10*x = 5/7 // : 9/10
x = 5/7/9/10
x = 50/63
x = 50/63
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