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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
(3*(x-5)^-2)/3 = 0
1/((x-5)^2) = 0
x belongs to the empty set
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