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D( X )
X-5 = 0
X-5 = 0
X-5 = 0
X-5 = 0 // + 5
X = 5
X in (-oo:5) U (5:+oo)
2/(X-5) = 6 // - 6
2/(X-5)-6 = 0
2/(X-5)+(-6*(X-5))/(X-5) = 0
2-6*(X-5) = 0
32-6*X = 0
(32-6*X)/(X-5) = 0
(32-6*X)/(X-5) = 0 // * X-5
32-6*X = 0
32-6*X = 0 // - 32
-6*X = -32 // : -6
X = -32/(-6)
X = 16/3
X = 16/3
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