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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
2/X = 3/15 // - 3/15
2/X-(3/15) = 0
2/X-1/5 = 0
2*X^-1 = 1/5 // : 2
X^-1 = 1/10
-1 < 0
1/(X^1) = 1/10 // * X^1
1 = 1/10*X^1 // : 1/10
10 = X^1
X = 10
X = 10
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