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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
10/X = 0.6427876 // - 0.6427876
10/X-0.6427876 = 0
10*X^-1 = 0.6427876 // : 10
X^-1 = 0.06427876
-1 < 0
1/(X^1) = 0.06427876 // * X^1
1 = 0.06427876*X^1 // : 0.06427876
15.5572385 = X^1
X = 15.5572385
X = 15.5572385
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