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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(64*200)/X = 18.26 // - 18.26
(64*200)/X-18.26 = 0
12800*X^-1 = 18.26 // : 12800
X^-1 = 0.00142656
-1 < 0
1/(X^1) = 0.00142656 // * X^1
1 = 0.00142656*X^1 // : 0.00142656
700.98698968 = X^1
X = 700.98698968
X = 700.98698968
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