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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 40/64 // - 40/64
5/x-(40/64) = 0
5/x-5/8 = 0
5*x^-1 = 5/8 // : 5
x^-1 = 1/8
-1 < 0
1/(x^1) = 1/8 // * x^1
1 = 1/8*x^1 // : 1/8
8 = x^1
x = 8
x = 8
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