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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
417.6/x = 21 // - 21
417.6/x-21 = 0
417.6*x^-1 = 21 // : 417.6
x^-1 = 0.05028736
-1 < 0
1/(x^1) = 0.05028736 // * x^1
1 = 0.05028736*x^1 // : 0.05028736
19.88571283 = x^1
x = 19.88571283
x = 19.88571283
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