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(5/7)*x-(1/7) = 3 // - 3
(5/7)*x-(1/7)-3 = 0
(5/7)*x-1/7-3 = 0
5/7*x-22/7 = 0 // + 22/7
5/7*x = 22/7 // : 5/7
x = 22/7/5/7
x = 22/5
x = 22/5
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