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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.58 = 1658/x // - 1658/x
1.58-(1658/x) = 0
1.58-1658*x^-1 = 0
-1658*x^-1 = -1.58 // : -1658
x^-1 = 0.00095296
-1 < 0
1/(x^1) = 0.00095296 // * x^1
1 = 0.00095296*x^1 // : 0.00095296
1049.36198791 = x^1
x = 1049.36198791
x = 1049.36198791
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