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y in (-oo:+oo)
y*((6*y^2)/18)+y^2 = 0
1/3*y^3+y^2 = 0
y^2*(1/3*y+1) = 0
1/3*y+1 = 0 // - 1
1/3*y = -1 // : 1/3
y = -1/1/3
y = -3
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in { -3, 0 }
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