If you mean Expression, then a math expression is any collection of numbers, variables, and operations with no given answer
Examples of Expressions:
2+2
2x+7
53+7f
Examples of what are NOT expressions (AKA, Equations):
2+2=4
2x+7=y
10x+7=0
The difference is all in whether or not you have a given answer on the other side of the "=". It doesn't matter whether or not it gives you the numerical value of it. So, a variable is still a possible answer to an equation to make it not an expression.
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Multiply by (1/2) = 0.5, or divide by 2.
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Math that is in none of the catagories of math
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