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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10469/x = 3.5 // - 3.5
10469/x-3.5 = 0
10469*x^-1 = 3.5 // : 10469
x^-1 = 0.00033432
-1 < 0
1/(x^1) = 0.00033432 // * x^1
1 = 0.00033432*x^1 // : 0.00033432
2991.14620723 = x^1
x = 2991.14620723
x = 2991.14620723
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