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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1/X+4/X-6 = 0
5*X^-1 = 6 // : 5
X^-1 = 6/5
-1 < 0
1/(X^1) = 6/5 // * X^1
1 = 6/5*X^1 // : 6/5
5/6 = X^1
X = 5/6
X = 5/6
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