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5-((1/15)*x) = (1/10)*x // - (1/10)*x
5-((1/15)*x)-((1/10)*x) = 0
(-1/15)*x+(-1/10)*x+5 = 0
5-1/6*x = 0 // - 5
-1/6*x = -5 // : -1/6
x = -5/(-1/6)
x = 30
x = 30
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