There are infinitely many expressions for the number 7, as it can be represented in various mathematical forms. Some examples include 7, 3+4, 10-3, 14/2, 2^3, and sqrt(49). These expressions can involve addition, subtraction, multiplication, division, exponentiation, and square roots, among others.
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That means that the two expressions represent the same number.
The same as in many other expressions. It is a variable, that is, it can be replaced by any number.
None of the "following" expressions!
one
4+(20-7)