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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.03 = 8.21/x // - 8.21/x
2.03-(8.21/x) = 0
2.03-8.21*x^-1 = 0
-8.21*x^-1 = -2.03 // : -8.21
x^-1 = 0.24725944
-1 < 0
1/(x^1) = 0.24725944 // * x^1
1 = 0.24725944*x^1 // : 0.24725944
4.04433497 = x^1
x = 4.04433497
x = 4.04433497
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