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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)
((((2*x^5)/3)^7)/(x^4))/7 = 0
128/15309*x^31 = 0 // : 128/15309
x^31 = 0
x = 0
x in { 0}
x belongs to the empty set
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