The variable is the letter, the thing that can be changed.
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algebra involves equations with numbers a variables and your goal is to solve for the variable
a variable (an unknown number/ any number).
A variable in algebra is an unknown quantity as for example in the term 5y the variable is y
What do you want it to mean. As a variable it can be used for any amount of any substance.
It is simply a variable - it represents a number which can take different values.