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X in (-oo:+oo)
4-((1/3)*X) = (1/9)*X // - (1/9)*X
4-((1/3)*X)-((1/9)*X) = 0
(-1/3)*X+(-1/9)*X+4 = 0
4-4/9*X = 0 // - 4
-4/9*X = -4 // : -4/9
X = -4/(-4/9)
X = 9
X = 9
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