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y in (-oo:+oo)
(1/6)*(y+1/6) = (2/3)*(y+1/6) // - (2/3)*(y+1/6)
(1/6)*(y+1/6)-((2/3)*(y+1/6)) = 0
(1/6)*(y+1/6)+(-2/3)*(y+1/6) = 0
1/6*(y+1/6)-2/3*(y+1/6) = 0
1/6*(y+1/6)-2/3*(y+1/6) = 0
-1/2*y-1/12 = 0
-1/2*y-1/12 = 0
-1/2*y-1/12 = 0 // + 1/12
-1/2*y = 1/12 // : -1/2
y = 1/12/(-1/2)
y = -1/6
y = -1/6
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