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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/x = 0.3077 // - 0.3077
20/x-0.3077 = 0
20*x^-1 = 0.3077 // : 20
x^-1 = 0.015385
-1 < 0
1/(x^1) = 0.015385 // * x^1
1 = 0.015385*x^1 // : 0.015385
64.99837504 = x^1
x = 64.99837504
x = 64.99837504
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