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D( x )
x-11 = 0
x-11 = 0
x-11 = 0
x-11 = 0 // + 11
x = 11
x in (-oo:11) U (11:+oo)
9/(x-11) = 3 // - 3
9/(x-11)-3 = 0
9/(x-11)+(-3*(x-11))/(x-11) = 0
9-3*(x-11) = 0
42-3*x = 0
(42-3*x)/(x-11) = 0
(42-3*x)/(x-11) = 0 // * x-11
42-3*x = 0
42-3*x = 0 // - 42
-3*x = -42 // : -3
x = -42/(-3)
x = 14
x = 14
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