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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-(1/x)-8-2 = 1 // - 1
x/x-(1/x)-8-2-1 = 0
x/x-x^-1-8-2-1 = 0
-1*x^-1 = 10 // : -1
x^-1 = -10
-1 < 0
1/(x^1) = -10 // * x^1
1 = -10*x^1 // : -10
-1/10 = x^1
x = -1/10
x = -1/10
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