Rational numbers and Real numbers
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The number -4 belongs to the set of all integers. It also belongs to the rationals, reals, complex numbers.
-5 to a set number is -5
It belongs to any set that contains it. For example, the set {5, sqrt(0.4), pi, Richard, Japan, Purple}. It is also an irrational number, a real number.
1 _ 3
-29 is an element of the real number system. That is to say, it belongs to the set of real numbers.