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15-((1/5)*x) = (1/10)*x // - (1/10)*x
15-((1/5)*x)-((1/10)*x) = 0
(-1/5)*x+(-1/10)*x+15 = 0
15-3/10*x = 0 // - 15
-3/10*x = -15 // : -3/10
x = -15/(-3/10)
x = 50
x = 50
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