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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.46 = 246/x // - 246/x
0.46-(246/x) = 0
0.46-246*x^-1 = 0
-246*x^-1 = -0.46 // : -246
x^-1 = 0.00186992
-1 < 0
1/(x^1) = 0.00186992 // * x^1
1 = 0.00186992*x^1 // : 0.00186992
534.78223667 = x^1
x = 534.78223667
x = 534.78223667
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