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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.5/x = 6.25 // - 6.25
0.5/x-6.25 = 0
0.5*x^-1 = 6.25 // : 0.5
x^-1 = 12.5
-1 < 0
1/(x^1) = 12.5 // * x^1
1 = 12.5*x^1 // : 12.5
0.08 = x^1
x = 0.08
x = 0.08
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