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