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x in (-oo:+oo)
8-((1/3)*x) = (1/9)*x // - (1/9)*x
8-((1/3)*x)-((1/9)*x) = 0
(-1/3)*x+(-1/9)*x+8 = 0
8-4/9*x = 0 // - 8
-4/9*x = -8 // : -4/9
x = -8/(-4/9)
x = 18
x = 18
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