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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
1/(x-6) = -1/5 // + -1/5
1/(x-6)-(-1/5) = 0
1/(x-6)+1/5 = 0
(1*5)/(5*(x-6))+(1*(x-6))/(5*(x-6)) = 0
1*(x-6)+1*5 = 0
x-1 = 0
(x-1)/(5*(x-6)) = 0
(x-1)/(5*(x-6)) = 0 // * 5*(x-6)
x-1 = 0
x-1 = 0 // + 1
x = 1
x = 1
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