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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)
1/(x-8)-1 = 7/(x-8) // - 7/(x-8)
1/(x-8)-(7/(x-8))-1 = 0
1/(x-8)-7*(x-8)^-1-1 = 0
1/(x-8)-7/(x-8)-1 = 0
1/(x-8)-7/(x-8)+(-1*(x-8))/(x-8) = 0
1-1*(x-8)-7 = 0
8-x-6 = 0
2-x = 0
(2-x)/(x-8) = 0
(2-x)/(x-8) = 0 // * x-8
2-x = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x = 2
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