A variable is an unknown, so algebra equations contain them. there are lots of different ways you can see a variable though whether it be in chemistry physics , business or just a math course. They can be huge equations or just simple ones. But there will be an unknown. Usually denoted as a "x" or "y" etc
For example 4x+3y^2+10x-2y+8x
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It is a constant.
4x- x
an algebraic expression
An expression.
Like terms.