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y in (-oo:+oo)
((45*(y-4)*(3*y-5))/9)*(3*y-5)*(y+2) = 0
(45*(y-4)*(3*y-5)^2*(y+2))/9 = 0
( 3*y-5 )
3*y-5 = 0 // + 5
3*y = 5 // : 3
y = 5/3
( y+2 )
y+2 = 0 // - 2
y = -2
( y-4 )
y-4 = 0 // + 4
y = 4
y in { 5/3, 5/3, -2, 4 }
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