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y in (-oo:+oo)
10*y^4-(((5*y^2)/5)*y^2)-(15*y^3) = 0
10*y^4-y^4-15*y^3 = 0
9*y^4-15*y^3 = 0
3*y^3*(3*y-5) = 0
3*y-5 = 0 // + 5
3*y = 5 // : 3
y = 5/3
3*y^3 = 0
3*y^3 = 0 // : 3
y^3 = 0
y = 0
y in { 5/3, 0 }
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