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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-X-(4/X)-(5/X)-8 = 1/x // - 1/x
X-X-(4/X)-(5/X)-(1/x)-8 = 0
X-X-4*X^-1-5*X^-1-x^-1-8 = 0
-1*x^-1 = -(-9*X^-1-8) // : -1
x^-1 = -9*X^-1-8
-1 < 0
1/(x^1) = -9*X^-1-8 // * x^1
1 = x^1*(-9*X^-1-8) // : -9*X^-1-8
1/(-9*X^-1-8) = x^1
x = 1/(-9*X^-1-8)
x = 1/(-9*X^-1-8)
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