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