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(3/7)*x+1 = 17/14 // - 17/14
(3/7)*x-(17/14)+1 = 0
(3/7)*x-17/14+1 = 0
3/7*x-3/14 = 0 // + 3/14
3/7*x = 3/14 // : 3/7
x = 3/14/3/7
x = 1/2
x = 1/2
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