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Babylonians were able to find unknown variables.
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Egyptians did algebra on a rhind papyrus to find more complex variables.
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He wrote a series of books called Arithmetica when he wrote symbols representing variables.
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Jains write the Sthananga Sutra which talked about the theory of numbers and other equations.
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The hero of Alexandria references square roots of negative numbers.
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First to teach algebra in an elementary state and introduced hindu-arabic numerals wrote the “The Compendious Book on Calculation by Completion and Balancing” where he talked about algebraic equations.
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Printing press is invented in Europe allowing them to translate arab equation.
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Girolamo wrote on probability and a book on the rules of algebra.
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There was communication of modern ideas of algebra and finding variables.
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Math became a profession and people started practicing modern algebra.