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y in (-oo:+oo)
4*y^3+5*y^2+((6*y)/2)*y = 0
4*y^3+8*y^2 = 0
4*y^2*(y+2) = 0
y+2 = 0 // - 2
y = -2
4*y^2 = 0
4*y^2 = 0 // : 4
y^2 = 0
y = 0
y in { -2, 0 }
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