Variable
It's got an unknown value.
If you've got an expression with a variable, say... 3x
Depending on what value you subsitute for 'x', the expression is going to turn out differently.
Let's put in 5.
3x -> 3(5) -> 3 * 5 -> 15
Now let's try 2.
3x -> 3(2) -> 3 * 2 -> 6
See how the final value varies?
Related Terms: substitution, combining like terms
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