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6-((1/5)*x) = (1/10)*x // - (1/10)*x
6-((1/5)*x)-((1/10)*x) = 0
(-1/5)*x+(-1/10)*x+6 = 0
6-3/10*x = 0 // - 6
-3/10*x = -6 // : -3/10
x = -6/(-3/10)
x = 20
x = 20
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