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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^7*z^5)/(x^4))*z = 0
x^3*z^6 = 0 // : z^6
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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