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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)
3/(X-6) = 6 // - 6
3/(X-6)-6 = 0
3/(X-6)+(-6*(X-6))/(X-6) = 0
3-6*(X-6) = 0
39-6*X = 0
(39-6*X)/(X-6) = 0
(39-6*X)/(X-6) = 0 // * X-6
39-6*X = 0
39-6*X = 0 // - 39
-6*X = -39 // : -6
X = -39/(-6)
X = 13/2
X = 13/2
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