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y in (-oo:+oo)
3*y^5-(((12*y^2)/3)*y^2) = 0
3*y^5-4*y^4 = 0
3*y^5-4*y^4 = 0
y^4*(3*y-4) = 0
3*y-4 = 0 // + 4
3*y = 4 // : 3
y = 4/3
y^4 = 0
1*y^4 = 0 // : 1
y^4 = 0
y = 0
y in { 4/3, 0 }
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