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x in (-oo:+oo)
(2/9)*x-((1/6)*x) = (2/3)*x+11 // - (2/3)*x+11
(2/9)*x-((1/6)*x)-((2/3)*x)-11 = 0
(2/9)*x+(-1/6)*x+(-2/3)*x-11 = 0
-11/18*x-11 = 0 // + 11
-11/18*x = 11 // : -11/18
x = 11/(-11/18)
x = -18
x = -18
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