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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
45.2/x = 0.89 // - 0.89
45.2/x-0.89 = 0
45.2*x^-1 = 0.89 // : 45.2
x^-1 = 0.01969027
-1 < 0
1/(x^1) = 0.01969027 // * x^1
1 = 0.01969027*x^1 // : 0.01969027
50.78650521 = x^1
x = 50.78650521
x = 50.78650521
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