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D( X )
2*X = 0
2*X = 0
2*X = 0
2*X = 0 // : 2
X = 0
X in (-oo:0) U (0:+oo)
1/(2*X)+5/6 = 0
1/2*X^-1 = -5/6 // : 1/2
X^-1 = -5/3
-1 < 0
1/(X^1) = -5/3 // * X^1
1 = -5/3*X^1 // : -5/3
-3/5 = X^1
X = -3/5
X = -3/5
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