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12-((1/10)*x) = (1/5)*x // - (1/5)*x
12-((1/10)*x)-((1/5)*x) = 0
(-1/10)*x+(-1/5)*x+12 = 0
12-3/10*x = 0 // - 12
-3/10*x = -12 // : -3/10
x = -12/(-3/10)
x = 40
x = 40
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