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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
3/X+18 = 5/X+6/X-5 // - 5/X+6/X-5
3/X-(5/X)-(6/X)+5+18 = 0
3/X-5*X^-1-6*X^-1+5+18 = 0
-8*X^-1 = -23 // : -8
X^-1 = 23/8
-1 < 0
1/(X^1) = 23/8 // * X^1
1 = 23/8*X^1 // : 23/8
8/23 = X^1
X = 8/23
X = 8/23
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