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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 5/6 // - 5/6
8/x-(5/6) = 0
8/x-5/6 = 0
8*x^-1 = 5/6 // : 8
x^-1 = 5/48
-1 < 0
1/(x^1) = 5/48 // * x^1
1 = 5/48*x^1 // : 5/48
48/5 = x^1
x = 48/5
x = 48/5
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