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