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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
3.6/X = 8 // - 8
3.6/X-8 = 0
3.6*X^-1 = 8 // : 3.6
X^-1 = 2.22222222
-1 < 0
1/(X^1) = 2.22222222 // * X^1
1 = 2.22222222*X^1 // : 2.22222222
0.45 = X^1
X = 0.45
X = 0.45
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