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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
X+2/X+8 = X-(2/X)+4 // - X-(2/X)+4
X-X+2/X+2/X-4+8 = 0
4*X^-1 = -4 // : 4
X^-1 = -1
-1 < 0
1/(X^1) = -1 // * X^1
1 = -1*X^1 // : -1
-1 = X^1
X = -1
X = -1
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