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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-8 = 7-7/x // - 7-7/x
x/x-(-7/x)-8-7 = 0
7*x^-1+x/x-8-7 = 0
7*x^-1 = 14 // : 7
x^-1 = 2
-1 < 0
1/(x^1) = 2 // * x^1
1 = 2*x^1 // : 2
1/2 = x^1
x = 1/2
x = 1/2
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