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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(-12*x^3)/(x^3)-(5*x^4) = 0
(-12*x^3)/(x^3)-5*x^4 = 0
-5*x^4 = 12 // : -5
x^4 = -12/5
x belongs to the empty set
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