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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(45.08/x) = 0.3 // - 0.3
1-(45.08/x)-0.3 = 0
1-45.08*x^-1-0.3 = 0
-45.08*x^-1 = -0.7 // : -45.08
x^-1 = 0.01552795
-1 < 0
1/(x^1) = 0.01552795 // * x^1
1 = 0.01552795*x^1 // : 0.01552795
64.40000129 = x^1
x = 64.40000129
x = 64.40000129
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