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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-3))/(x^4) = 0
( 2 )
2 = 0
x belongs to the empty set
( x-3 )
x-3 = 0 // + 3
x = 3
x = 3
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