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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/16)/x = 283 // - 283
(1/16)/x-283 = 0
1/16*x^-1 = 283 // : 1/16
x^-1 = 4528
-1 < 0
1/(x^1) = 4528 // * x^1
1 = 4528*x^1 // : 4528
1/4528 = x^1
x = 1/4528
x = 1/4528
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