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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(5*x+6)/(x-1)-6 = 0
(5*x+6)/(x-1)+(-6*(x-1))/(x-1) = 0
5*x-6*(x-1)+6 = 0
12-x = 0
(12-x)/(x-1) = 0
(12-x)/(x-1) = 0 // * x-1
12-x = 0
12-x = 0 // - 12
-x = -12 // * -1
x = 12
x = 12
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