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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.25 = 16.25/x // - 16.25/x
0.25-(16.25/x) = 0
0.25-16.25*x^-1 = 0
-16.25*x^-1 = -0.25 // : -16.25
x^-1 = 0.01538462
-1 < 0
1/(x^1) = 0.01538462 // * x^1
1 = 0.01538462*x^1 // : 0.01538462
64.9999805 = x^1
x = 64.9999805
x = 64.9999805
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