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