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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(181.3/x) = 0.3 // - 0.3
1-(181.3/x)-0.3 = 0
1-181.3*x^-1-0.3 = 0
-181.3*x^-1 = -0.7 // : -181.3
x^-1 = 0.003861
-1 < 0
1/(x^1) = 0.003861 // * x^1
1 = 0.003861*x^1 // : 0.003861
259.000259 = x^1
x = 259.000259
x = 259.000259
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