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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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