find the value of a is equals to set of X is 2 x squared is equal to 4 and 5 x + 2 is equals to 12 is an empty set or singleton set
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In mathematics, a singleton, also known as a unit set, is a set with exactly one element. For example, the set {null } is a singleton containing the element null.
The term is also used for a 1-tuple (a sequence with one member).
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