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12-((1/15)*x) = (1/5)*x // - (1/5)*x
12-((1/15)*x)-((1/5)*x) = 0
(-1/15)*x+(-1/5)*x+12 = 0
12-4/15*x = 0 // - 12
-4/15*x = -12 // : -4/15
x = -12/(-4/15)
x = 45
x = 45
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