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y in (-oo:+oo)
15*y^4-(((5*y^2)/5)*y^2)-(25*y^3) = 0
15*y^4-y^4-25*y^3 = 0
14*y^4-25*y^3 = 0
y^3*(14*y-25) = 0
14*y-25 = 0 // + 25
14*y = 25 // : 14
y = 25/14
y^3 = 0
1*y^3 = 0 // : 1
y^3 = 0
y = 0
y in { 25/14, 0 }
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