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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) = 3 // - 3
1/(x-6)-3 = 0
1/(x-6)+(-3*(x-6))/(x-6) = 0
1-3*(x-6) = 0
19-3*x = 0
(19-3*x)/(x-6) = 0
(19-3*x)/(x-6) = 0 // * x-6
19-3*x = 0
19-3*x = 0 // - 19
-3*x = -19 // : -3
x = -19/(-3)
x = 19/3
x = 19/3
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