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