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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
7/X-1 = 14/X-1 // - 14/X-1
7/X-(14/X)-1+1 = 0
7/X-14*X^-1-1+1 = 0
-7*X^-1 = 0 // : -7
X^-1 = 0
X naleu017Cy do O
X belongs to the empty set
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