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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-3)/(x-4) = 3 // - 3
(x-3)/(x-4)-3 = 0
(x-3)/(x-4)+(-3*(x-4))/(x-4) = 0
x-3*(x-4)-3 = 0
9-2*x = 0
(9-2*x)/(x-4) = 0
(9-2*x)/(x-4) = 0 // * x-4
9-2*x = 0
9-2*x = 0 // - 9
-2*x = -9 // : -2
x = -9/(-2)
x = 9/2
x = 9/2
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