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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
5/7 = 69.6/X // - 69.6/X
5/7-(69.6/X) = 0
5/7-69.6*X^-1 = 0
-69.6*X^-1 = -5/7 // : -69.6
X^-1 = 0.01026273
-1 < 0
1/(X^1) = 0.01026273 // * X^1
1 = 0.01026273*X^1 // : 0.01026273
97.43995993 = X^1
X = 97.43995993
X = 97.43995993
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