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