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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
6/X-0.14 = 0.12 // - 0.12
6/X-0.14-0.12 = 0
6*X^-1 = 0.26 // : 6
X^-1 = 0.04333333
-1 < 0
1/(X^1) = 0.04333333 // * X^1
1 = 0.04333333*X^1 // : 0.04333333
23.07692485 = X^1
X = 23.07692485
X = 23.07692485
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