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