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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)
(3*x-6)/(5-x) = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x = 2
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