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D( x )
(3-x)^2 = 0
(3-x)^2 = 0
(3-x)^2 = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in (-oo:3) U (3:+oo)
((6-x)^2)/((3-x)^2) = 0
6-x = 0 // - 6
-x = -6 // * -1
x = 6
x in { 6, 6 }
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