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y in (-oo:+oo)
(1/3)*(9-y) = y+1 // - y+1
(1/3)*(9-y)-y-1 = 0
1/3*(9-y)-y-1 = 0
1/3*(9-y)-y-1 = 0
3-4/3*y-1 = 0
2-4/3*y = 0
2-4/3*y = 0
2-4/3*y = 0 // - 2
-4/3*y = -2 // : -4/3
y = -2/(-4/3)
y = 3/2
y = 3/2
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