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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-((x+4)/x) = -4/x-2 // + -4/x-2
2-((x+4)/x)-(-4/x) = 0
4*x^-1-((x+4)/x)+2 = 0
(-1*(x+4))/x+4/x+2 = 0
(-1*(x+4))/x+4/x+(2*x)/x = 0
2*x-1*(x+4)+4 = 0
2*x-x = 0
x = 0
x/x = 0
x/x = 0 // * x
x = 0
x = 0
x in { 0}
x belongs to the empty set
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