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D( x )
x-8 = 0
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:8) U (8:+oo)
7/(x-8) = 1/(x-8)+1 // - 1/(x-8)+1
7/(x-8)-(1/(x-8))-1 = 0
7/(x-8)-(x-8)^-1-1 = 0
7/(x-8)-1/(x-8)-1 = 0
7/(x-8)-1/(x-8)+(-1*(x-8))/(x-8) = 0
7-1*(x-8)-1 = 0
6-x+8 = 0
14-x = 0
(14-x)/(x-8) = 0
(14-x)/(x-8) = 0 // * x-8
14-x = 0
14-x = 0 // - 14
-x = -14 // * -1
x = 14
x = 14
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