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(3/7)*x-5 = 5/7 // - 5/7
(3/7)*x-(5/7)-5 = 0
(3/7)*x-5/7-5 = 0
3/7*x-40/7 = 0 // + 40/7
3/7*x = 40/7 // : 3/7
x = 40/7/3/7
x = 40/3
x = 40/3
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