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x in (-oo:+oo)
20*x^4-(x^2*((24*x^3)/4)) = 0
20*x^4-6*x^5 = 0
20*x^4-6*x^5 = 0
2*x^4*(10-3*x) = 0
10-3*x = 0 // - 10
-3*x = -10 // : -3
x = -10/(-3)
x = 10/3
2*x^4 = 0
2*x^4 = 0 // : 2
x^4 = 0
x = 0
x in { 10/3, 0 }
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