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3/10-((1/12)*x)-((1/10)*x)-(1/5) = 0
(-1/12)*x+(-1/10)*x+3/10-1/5 = 0
1/10-11/60*x = 0 // - 1/10
-11/60*x = -1/10 // : -11/60
x = -1/10/(-11/60)
x = 6/11
x = 6/11
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