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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100/x = 473.81 // - 473.81
100/x-473.81 = 0
100*x^-1 = 473.81 // : 100
x^-1 = 4.7381
-1 < 0
1/(x^1) = 4.7381 // * x^1
1 = 4.7381*x^1 // : 4.7381
0.21105506 = x^1
x = 0.21105506
x = 0.21105506
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