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