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