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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(69*200000)/X = 17.92 // - 17.92
(69*200000)/X-17.92 = 0
13800000*X^-1 = 17.92 // : 13800000
X^-1 = 0.0000013
-1 < 0
1/(X^1) = 0.0000013 // * X^1
1 = 0.0000013*X^1 // : 0.0000013
769230.76923077 = X^1
X = 769230.76923077
X = 769230.76923077
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