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(1/2)*x+(1/5)*x = 31-((1/3)*x) // - 31-((1/3)*x)
(1/2)*x+(1/5)*x+(1/3)*x-31 = 0
31/30*x-31 = 0 // + 31
31/30*x = 31 // : 31/30
x = 31/31/30
x = 30
x = 30
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