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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 7/10 // - 7/10
8/x-(7/10) = 0
8/x-7/10 = 0
8*x^-1 = 7/10 // : 8
x^-1 = 7/80
-1 < 0
1/(x^1) = 7/80 // * x^1
1 = 7/80*x^1 // : 7/80
80/7 = x^1
x = 80/7
x = 80/7
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