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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
9/X+3 = 8/X-2 // - 8/X-2
9/X-(8/X)+2+3 = 0
9/X-8*X^-1+2+3 = 0
1*X^-1 = -5 // : 1
X^-1 = -5
-1 < 0
1/(X^1) = -5 // * X^1
1 = -5*X^1 // : -5
-1/5 = X^1
X = -1/5
X = -1/5
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