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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
61.1/81.3 = 592/x // - 592/x
61.1/81.3-(592/x) = 0
61.1/81.3-592*x^-1 = 0
-592*x^-1 = -0.75153752 // : -592
x^-1 = 0.00126949
-1 < 0
1/(x^1) = 0.00126949 // * x^1
1 = 0.00126949*x^1 // : 0.00126949
787.71790246 = x^1
x = 787.71790246
x = 787.71790246
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