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a in (-oo:+oo)
(35*a^9)/5-((15*a^5)/4) = 0
(35*a^9)/5+(-15/4)*a^5 = 0
7*a^9-15/4*a^5 = 0
a^5*(7*a^4-15/4) = 0
7*a^4 = 15/4 // : 7
a^4 = 15/28
a^4 = 15/28 // ^ 1/4
abs(a) = (15/28)^(1/4)
a = (15/28)^(1/4) or a = -(15/28)^(1/4)
a^5 = 0
1*a^5 = 0 // : 1
a^5 = 0
a = 0
a in { (15/28)^(1/4), -(15/28)^(1/4), 0 }
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