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(6/7)*x-7 = 17/7 // - 17/7
(6/7)*x-(17/7)-7 = 0
(6/7)*x-17/7-7 = 0
6/7*x-66/7 = 0 // + 66/7
6/7*x = 66/7 // : 6/7
x = 66/7/6/7
x = 11
x = 11
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