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(12/5)*x+7 = 31-((2/5)*x) // - 31-((2/5)*x)
(12/5)*x+(2/5)*x-31+7 = 0
14/5*x-24 = 0 // + 24
14/5*x = 24 // : 14/5
x = 24/14/5
x = 60/7
x = 60/7
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