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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 5/7 // - 5/7
8/x-(5/7) = 0
8/x-5/7 = 0
8*x^-1 = 5/7 // : 8
x^-1 = 5/56
-1 < 0
1/(x^1) = 5/56 // * x^1
1 = 5/56*x^1 // : 5/56
56/5 = x^1
x = 56/5
x = 56/5
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