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x in (-oo:+oo)
(2/3)*x-((1/3)*x) = (4/9)*x+1 // - (4/9)*x+1
(2/3)*x-((1/3)*x)-((4/9)*x)-1 = 0
(2/3)*x+(-1/3)*x+(-4/9)*x-1 = 0
-1/9*x-1 = 0 // + 1
-1/9*x = 1 // : -1/9
x = 1/(-1/9)
x = -9
x = -9
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