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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
365/x = 15.85 // - 15.85
365/x-15.85 = 0
365*x^-1 = 15.85 // : 365
x^-1 = 0.04342466
-1 < 0
1/(x^1) = 0.04342466 // * x^1
1 = 0.04342466*x^1 // : 0.04342466
23.02838986 = x^1
x = 23.02838986
x = 23.02838986
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