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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
10000/X = 1.5 // - 1.5
10000/X-1.5 = 0
10000*X^-1 = 1.5 // : 10000
X^-1 = 0.00015
-1 < 0
1/(X^1) = 0.00015 // * X^1
1 = 0.00015*X^1 // : 0.00015
6666.66666667 = X^1
X = 6666.66666667
X = 6666.66666667
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