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D( x )
(2*x)^4 = 0
(2*x)^4 = 0
(2*x)^4 = 0
16*x^4 = 0 // : 16
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x^5)/((2*x)^4) = 0
3/16*x = 0 // : 3/16
x = 0
x in { 0}
x belongs to the empty set
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