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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(159*200000)/X = 8.5 // - 8.5
(159*200000)/X-8.5 = 0
31800000*X^-1 = 8.5 // : 31800000
X^-1 = 0.00000027
-1 < 0
1/(X^1) = 0.00000027 // * X^1
1 = 0.00000027*X^1 // : 0.00000027
3703703.7037037 = X^1
X = 3703703.7037037
X = 3703703.7037037
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