Do unto one side of the equation what you do to the other
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the founder of algebra are the Arabs. They discovered it when it was their golden age when Profit Mohammed was around.
There is no one rule to algebra. There are different rules that apply to different functions.
The rule method specifies a set of by describing its elements and enclosing them in braces.
The person who developed algebra was famous Muslim mathematician Al-Khawarizmi. He is know as the "father" of algebra, and lived during the Golden Age of Islamic civilization during the Abbasid Dynasty.