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D( X )
-2*X-6 = 0
-2*X-6 = 0
-2*X-6 = 0
-2*X-6 = 0 // + 6
-2*X = 6 // : -2
X = 6/(-2)
X = -3
X in (-oo:-3) U (-3:+oo)
(13*X+4)/(-2*X-6) = 8 // - 8
(13*X+4)/(-2*X-6)-8 = 0
(13*X+4)/(-2*X-6)+(-8*(-2*X-6))/(-2*X-6) = 0
13*X-8*(-2*X-6)+4 = 0
29*X+52 = 0
(29*X+52)/(-2*X-6) = 0
(29*X+52)/(-2*X-6) = 0 // * -2*X-6
29*X+52 = 0
29*X+52 = 0 // - 52
29*X = -52 // : 29
X = -52/29
X = -52/29
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