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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)
(X-5)/(X-6) = 56 // - 56
(X-5)/(X-6)-56 = 0
(X-5)/(X-6)+(-56*(X-6))/(X-6) = 0
X-56*(X-6)-5 = 0
331-55*X = 0
(331-55*X)/(X-6) = 0
(331-55*X)/(X-6) = 0 // * X-6
331-55*X = 0
331-55*X = 0 // - 331
-55*X = -331 // : -55
X = -331/(-55)
X = 331/55
X = 331/55
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