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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(145*200)/X = 8.57 // - 8.57
(145*200)/X-8.57 = 0
29000*X^-1 = 8.57 // : 29000
X^-1 = 0.00029552
-1 < 0
1/(X^1) = 0.00029552 // * X^1
1 = 0.00029552*X^1 // : 0.00029552
3383.86572821 = X^1
X = 3383.86572821
X = 3383.86572821
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