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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)
(3*x+1)/(x-4) = 4 // - 4
(3*x+1)/(x-4)-4 = 0
(3*x+1)/(x-4)+(-4*(x-4))/(x-4) = 0
3*x-4*(x-4)+1 = 0
17-x = 0
(17-x)/(x-4) = 0
(17-x)/(x-4) = 0 // * x-4
17-x = 0
17-x = 0 // - 17
-x = -17 // * -1
x = 17
x = 17
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