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7-((5/12)*x)-((1/10)*x)-3 = 0
(-5/12)*x+(-1/10)*x-3+7 = 0
4-31/60*x = 0 // - 4
-31/60*x = -4 // : -31/60
x = -4/(-31/60)
x = 240/31
x = 240/31
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