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D( x )
x = 0
x-4 = 0
x = 0
x = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:0) U (0:4) U (4:+oo)
1/(x-4) = -(6/x) // + 6/x
1/(x-4)+6/x = 0
(1*x)/(x*(x-4))+(6*(x-4))/(x*(x-4)) = 0
6*(x-4)+1*x = 0
7*x-24 = 0
(7*x-24)/(x*(x-4)) = 0
(7*x-24)/(x*(x-4)) = 0 // * x*(x-4)
7*x-24 = 0
7*x-24 = 0 // + 24
7*x = 24 // : 7
x = 24/7
x = 24/7
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