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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
3/X+10 = 4 // - 4
3/X-4+10 = 0
3*X^-1 = -6 // : 3
X^-1 = -2
-1 < 0
1/(X^1) = -2 // * X^1
1 = -2*X^1 // : -2
-1/2 = X^1
X = -1/2
X = -1/2
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