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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8 = -5/x-8 // + -5/x-8
8-(-5/x)+8 = 0
5*x^-1+8+8 = 0
5*x^-1 = -16 // : 5
x^-1 = -16/5
-1 < 0
1/(x^1) = -16/5 // * x^1
1 = -16/5*x^1 // : -16/5
-5/16 = x^1
x = -5/16
x = -5/16
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