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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-(4*(x+1))+(4*x)/x+1 = 0
4*x-4*(x+1)+(4*x)/x+1 = 0
4*x-4*(x+1)+1+4 = 0
4*x-4*(x+1)+1+4 = 0
1-4+4 = 0
1 = 0
1 = 0
x belongs to the empty set
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