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7/10-((1/12)*x)-((1/9)*x)-(1/5) = 0
(-1/12)*x+(-1/9)*x+7/10-1/5 = 0
1/2-7/36*x = 0 // - 1/2
-7/36*x = -1/2 // : -7/36
x = -1/2/(-7/36)
x = 18/7
x = 18/7
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