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D( x )
x-6 = 0
x-1 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:6) U (6:+oo)
9/(x-1) = -6/(x-6) // + -6/(x-6)
9/(x-1)-(-6/(x-6)) = 0
9/(x-1)+6*(x-6)^-1 = 0
9/(x-1)+6/(x-6) = 0
(9*(x-6))/((x-1)*(x-6))+(6*(x-1))/((x-1)*(x-6)) = 0
9*(x-6)+6*(x-1) = 0
15*x-60 = 0
(15*x-60)/((x-1)*(x-6)) = 0
(15*x-60)/((x-1)*(x-6)) = 0 // * (x-1)*(x-6)
15*x-60 = 0
15*x-60 = 0 // + 60
15*x = 60 // : 15
x = 60/15
x = 4
x = 4
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