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