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(1/5)*x+2/7 = 5/7 // - 5/7
(1/5)*x+2/7-(5/7) = 0
(1/5)*x+2/7-5/7 = 0
1/5*x-3/7 = 0 // + 3/7
1/5*x = 3/7 // : 1/5
x = 3/7/1/5
x = 15/7
x = 15/7
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