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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
6-(5/X) = 3/X+4 // - 3/X+4
6-(5/X)-(3/X)-4 = 0
6-5*X^-1-3*X^-1-4 = 0
-8*X^-1 = -2 // : -8
X^-1 = 1/4
-1 < 0
1/(X^1) = 1/4 // * X^1
1 = 1/4*X^1 // : 1/4
4 = X^1
X = 4
X = 4
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