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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20 = 0.6333/x // - 0.6333/x
20-(0.6333/x) = 0
20-0.6333*x^-1 = 0
-0.6333*x^-1 = -20 // : -0.6333
x^-1 = 31.58060951
-1 < 0
1/(x^1) = 31.58060951 // * x^1
1 = 31.58060951*x^1 // : 31.58060951
0.031665 = x^1
x = 0.031665
x = 0.031665
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