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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/(x-4) = 2 // - 2
x/(x-4)-2 = 0
x/(x-4)+(-2*(x-4))/(x-4) = 0
x-2*(x-4) = 0
8-x = 0
(8-x)/(x-4) = 0
(8-x)/(x-4) = 0 // * x-4
8-x = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x = 8
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