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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(32*200000)/X = 13.85 // - 13.85
(32*200000)/X-13.85 = 0
6400000*X^-1 = 13.85 // : 6400000
X^-1 = 0.00000216
-1 < 0
1/(X^1) = 0.00000216 // * X^1
1 = 0.00000216*X^1 // : 0.00000216
462962.96296296 = X^1
X = 462962.96296296
X = 462962.96296296
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