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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-(1/x)-2 = 8 // - 8
7/x-(1/x)-8-2 = 0
7/x-x^-1-8-2 = 0
6*x^-1 = 10 // : 6
x^-1 = 5/3
-1 < 0
1/(x^1) = 5/3 // * x^1
1 = 5/3*x^1 // : 5/3
3/5 = x^1
x = 3/5
x = 3/5
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