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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x-(9/x)-8-7 = 1 // - 1
8/x-(9/x)-8-7-1 = 0
8/x-9*x^-1-8-7-1 = 0
-1*x^-1 = 16 // : -1
x^-1 = -16
-1 < 0
1/(x^1) = -16 // * x^1
1 = -16*x^1 // : -16
-1/16 = x^1
x = -1/16
x = -1/16
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