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