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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-(5*(x/x+1))+1+6 = 0
x/x-5*(x/x+1)+1+6 = 0
1-5*2+1+6 = 0
1-5*2+1+6 = 0
1-9+6 = 0
6-8 = 0
-2 = 0
-2 = 0
x belongs to the empty set
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