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(1/12)*X+(5/6)*x-9 = 0
1/12*X+5/6*x-9 = 0 // - 1/12*X-9
5/6*x = -(1/12*X-9) // : 5/6
x = (-(1/12*X-9))/5/6
x = 6/5*(9-(1/12*X))
x = 6/5*(9-(1/12*X))
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