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x in (-oo:+oo)
(1/6)*x+2/3 = (5/6)*x+1/3 // - (5/6)*x+1/3
(1/6)*x-((5/6)*x)+2/3-(1/3) = 0
(1/6)*x+(-5/6)*x+2/3-1/3 = 0
1/3-2/3*x = 0 // - 1/3
-2/3*x = -1/3 // : -2/3
x = -1/3/(-2/3)
x = 1/2
x = 1/2
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