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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)
((4-x)^2)/(5-x) = 0
4-x = 0 // - 4
-x = -4 // * -1
x = 4
x in { 4, 4 }
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