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7/12-((11/15)*x)-((1/9)*x)-(1/6) = 0
(-11/15)*x+(-1/9)*x+7/12-1/6 = 0
5/12-38/45*x = 0 // - 5/12
-38/45*x = -5/12 // : -38/45
x = -5/12/(-38/45)
x = 75/152
x = 75/152
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