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