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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
-(2/X) = 7/X-9-1 // - 7/X-9-1
1-(2/X)-(7/X)+9 = 0
1-2*X^-1-7*X^-1+9 = 0
-9*X^-1 = -10 // : -9
X^-1 = 10/9
-1 < 0
1/(X^1) = 10/9 // * X^1
1 = 10/9*X^1 // : 10/9
9/10 = X^1
X = 9/10
X = 9/10
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