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a in (-oo:+oo)
(10*a^3)/2-((25*a^5)/4) = 0
(-25/4)*a^5+(10*a^3)/2 = 0
5*a^3-25/4*a^5 = 0
5*a^3*(1-5/4*a^2) = 0
-5/4*a^2 = -1 // : -5/4
a^2 = 4/5
a^2 = 4/5 // ^ 1/2
abs(a) = (4/5)^(1/2)
a = (4/5)^(1/2) or a = -(4/5)^(1/2)
5*a^3 = 0
5*a^3 = 0 // : 5
a^3 = 0
a = 0
a in { (4/5)^(1/2), -(4/5)^(1/2), 0 }
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