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10-((1/15)*x) = (1/10)*x // - (1/10)*x
10-((1/15)*x)-((1/10)*x) = 0
(-1/15)*x+(-1/10)*x+10 = 0
10-1/6*x = 0 // - 10
-1/6*x = -10 // : -1/6
x = -10/(-1/6)
x = 60
x = 60
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