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