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a in (-oo:+oo)
a*((15*a^4-(9*a))/3) = 0
a*((15*a^4-9*a)/3) = 0
(a*(15*a^4-9*a))/3 = 0
15*a^4-9*a = 0
3*a*(5*a^3-3) = 0
5*a^3 = 3 // : 5
a^3 = 3/5
a^3 = 3/5 // ^ 1/3
a = (3/5)^(1/3)
3*a*(a-(3/5)^(1/3)) = 0
(3*a*a*(a-(3/5)^(1/3)))/3 = 0
( 3*a )
3*a = 0 // : 3
a = 0
( a-(3/5)^(1/3) )
a-(3/5)^(1/3) = 0 // + (3/5)^(1/3)
a = (3/5)^(1/3)
( a )
a = 0
a in { 0, (3/5)^(1/3), 0 }
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