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(12/5)*x+7 = 31-((3/5)*x) // - 31-((3/5)*x)
(12/5)*x+(3/5)*x-31+7 = 0
3*x-24 = 0 // + 24
3*x = 24 // : 3
x = 24/3
x = 8
x = 8
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