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D( X )
X-1 = 0
X-1 = 0
X-1 = 0
X-1 = 0 // + 1
X = 1
X in (-oo:1) U (1:+oo)
7/(X-1) = 6 // - 6
7/(X-1)-6 = 0
7/(X-1)+(-6*(X-1))/(X-1) = 0
7-6*(X-1) = 0
13-6*X = 0
(13-6*X)/(X-1) = 0
(13-6*X)/(X-1) = 0 // * X-1
13-6*X = 0
13-6*X = 0 // - 13
-6*X = -13 // : -6
X = -13/(-6)
X = 13/6
X = 13/6
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