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D( x )
(16*x^1)/4 = 0
(16*x^1)/4 = 0
(16*x^1)/4 = 0
(16*x)/4 = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
((4*x^5)/6)/((16*x^1)/4) = 0
((4*x^5)/6)/((16*x)/4) = 0
1/6*x^4 = 0 // : 1/6
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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