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EnchantedLearning.com Algebra 
Variables together with mathematical symbols and operations can replace verbal statements. For example, the statement, "The area of a rectangle is the product of the legth and the width" can be summarized by the algebraic statement, "A=l x w."
This is a practical example of algebra being useful. If you want to go to a gym occasionally, but need to decide if you should pay $5 per visit or get a yearly pass for $100. Which option is best for you? This depends on how often you plan to go to the gym, but in order to make your decision, you need to figure out at which number visits these options are equal. If you go more often than this many times, you should get a membership. You can solve this problem using algebra. Let v equal the number of visits.

Algebra (originally called aljabr, meaning "restoration") was invented in the Middle East by Abu Ja'far Muhammad ibn Musa AlKhwarizmi (born in Baghdad about AD 825) during the Middle Ages.
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