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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
13000/X = 100 // - 100
13000/X-100 = 0
13000*X^-1 = 100 // : 13000
X^-1 = 1/130
-1 < 0
1/(X^1) = 1/130 // * X^1
1 = 1/130*X^1 // : 1/130
130 = X^1
X = 130
X = 130
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