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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
2/X = 144 // - 144
2/X-144 = 0
2*X^-1 = 144 // : 2
X^-1 = 72
-1 < 0
1/(X^1) = 72 // * X^1
1 = 72*X^1 // : 72
1/72 = X^1
X = 1/72
X = 1/72
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