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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
5/3 = 600/X // - 600/X
5/3-(600/X) = 0
5/3-600*X^-1 = 0
-600*X^-1 = -5/3 // : -600
X^-1 = 1/360
-1 < 0
1/(X^1) = 1/360 // * X^1
1 = 1/360*X^1 // : 1/360
360 = X^1
X = 360
X = 360
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