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x in (-oo:+oo)
9*x^5-(x^2*((12*x^4)/3)) = 0
9*x^5-4*x^6 = 0
9*x^5-4*x^6 = 0
x^5*(9-4*x) = 0
9-4*x = 0 // - 9
-4*x = -9 // : -4
x = -9/(-4)
x = 9/4
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in { 9/4, 0 }
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