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