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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x)/x-(5/x)-3 = 0
(6*x)/x-5*x^-1-3 = 0
-5*x^-1 = -3 // : -5
x^-1 = 3/5
-1 < 0
1/(x^1) = 3/5 // * x^1
1 = 3/5*x^1 // : 3/5
5/3 = x^1
x = 5/3
x = 5/3
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