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(3/7)*x+1 = 31/7 // - 31/7
(3/7)*x-(31/7)+1 = 0
(3/7)*x-31/7+1 = 0
3/7*x-24/7 = 0 // + 24/7
3/7*x = 24/7 // : 3/7
x = 24/7/3/7
x = 8
x = 8
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