In programming: They let you do generic calculations, with numbers that you don't know in advance.
In algebra: They let you do calculations with unknown values - either generic calculations, or do calculations to find such unknown values in a specific case.
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Jabibi the gas attendant
ummm...you really cant do tht
0.444 tht was easy ! (:
two sides tht never meet
7 megameters is 7 million meters.