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y in (-oo:+oo)
y^3*((3*y^2-(12*y))/9) = 0
y^3*((3*y^2-12*y)/9) = 0
(y^3*(3*y^2-12*y))/9 = 0
3*y^2-12*y = 0
3*y*(y-4) = 0
y-4 = 0 // + 4
y = 4
3*y*(y-4) = 0
(3*y*y^3*(y-4))/9 = 0
( 3*y )
3*y = 0 // : 3
y = 0
( y-4 )
y-4 = 0 // + 4
y = 4
( y^3 )
1*y^3 = 0 // : 1
y^3 = 0
y = 0
y in { 0, 4, 0 }
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