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(2/5)*x-2 = 5/7 // - 5/7
(2/5)*x-(5/7)-2 = 0
(2/5)*x-5/7-2 = 0
2/5*x-19/7 = 0 // + 19/7
2/5*x = 19/7 // : 2/5
x = 19/7/2/5
x = 95/14
x = 95/14
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