wat is expression

A mathematical expression is akin to a meaningful word phrase. It is a combination of mathematical symbols--variables, numbers and arithmetic symbols--that work together to solve mathematical problems.
A mathematical expression may be made up of one mathematical term or the algebraic addition (which includes the addition and subtraction of integers) of more than one mathematical term. A mathematical expression can be formed of only numbers, only variables, or both numbers and variables.
These are some examples of mathematical expressions:
7
x
y
5 + 2
3 + 9 í-- y
(6 í-- 5) + y - 2
10 -- x (z + 6)

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