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y in (-oo:+oo)
(2/3)*(y-6) = (1/3)*(3*y-9) // - (1/3)*(3*y-9)
(2/3)*(y-6)-((1/3)*(3*y-9)) = 0
(2/3)*(y-6)+(-1/3)*(3*y-9) = 0
2/3*(y-6)-1/3*(3*y-9) = 0
2/3*(y-6)-1/3*(3*y-9) = 0
-1/3*y-1 = 0
-1/3*y-1 = 0
-1/3*y-1 = 0 // + 1
-1/3*y = 1 // : -1/3
y = 1/(-1/3)
y = -3
y = -3
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