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x in (-oo:+oo)
X-((1/3)*x)-((1/2)*x)-9 = 0
X+(-1/3)*x+(-1/2)*x-9 = 0
X-5/6*x-9 = 0 // - X-9
-5/6*x = -(X-9) // : -5/6
x = (-(X-9))/(-5/6)
x = -6/5*(9-X)
x = -6/5*(9-X)
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