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D( x )
5-x = 0
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x in (-oo:5) U (5:+oo)
(6*x-4)/(5-x) = 0
6*x-4 = 0 // + 4
6*x = 4 // : 6
x = 4/6
x = 2/3
x = 2/3
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