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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
-22/X-5 = -12/X // + -12/X
-22/X-(-12/X)-5 = 0
12*X^-1-22/X-5 = 0
-10*X^-1 = 5 // : -10
X^-1 = -1/2
-1 < 0
1/(X^1) = -1/2 // * X^1
1 = -1/2*X^1 // : -1/2
-2 = X^1
X = -2
X = -2
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