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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*365+0)/x = 3 // - 3
(10*365+0)/x-3 = 0
(10*365)/x-3 = 0
3650*x^-1 = 3 // : 3650
x^-1 = 3/3650
-1 < 0
1/(x^1) = 3/3650 // * x^1
1 = 3/3650*x^1 // : 3/3650
3650/3 = x^1
x = 3650/3
x = 3650/3
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