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D( n )
5*n-25 = 0
5*n-25 = 0
5*n-25 = 0
5*n-25 = 0 // + 25
5*n = 25 // : 5
n = 25/5
n = 5
n in (-oo:5) U (5:+oo)
(n-5)/(5*n-25) = 0
n-5 = 0 // + 5
n = 5
n in { 5}
n belongs to the empty set
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