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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)
6/(x-4)+1/x = 0
(6*x)/(x*(x-4))+(1*(x-4))/(x*(x-4)) = 0
1*(x-4)+6*x = 0
7*x-4 = 0
(7*x-4)/(x*(x-4)) = 0
(7*x-4)/(x*(x-4)) = 0 // * x*(x-4)
7*x-4 = 0
7*x-4 = 0 // + 4
7*x = 4 // : 7
x = 4/7
x = 4/7
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