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(18/7)*x+7 = 31-((6/7)*x) // - 31-((6/7)*x)
(18/7)*x+(6/7)*x-31+7 = 0
24/7*x-24 = 0 // + 24
24/7*x = 24 // : 24/7
x = 24/24/7
x = 7
x = 7
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