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y in (-oo:+oo)
(4/9)*(y+1) = (5/9)*y // - (5/9)*y
(4/9)*(y+1)-((5/9)*y) = 0
(4/9)*(y+1)+(-5/9)*y = 0
4/9*(y+1)+(-5*y)/9 = 0
(4/9*9*(y+1))/9+(-5*y)/9 = 0
4/9*9*(y+1)-5*y = 0
4-y = 0
(4-y)/9 = 0
(4-y)/9 = 0 // * 9
4-y = 0
4-y = 0 // - 4
-y = -4 // * -1
y = 4
y = 4
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