Where did algebra come from?

Problems don't solve themselves. Problems don't make themselves either. People needed to invent both the methods and the problems of elementary mathematics. Who were those people?
Sources:
"A History of Mathematics" (Carl B. Boyer)
archive.org/details/historyof...
"The Development of Arabic Mathematics" (Roshdi Rashed)
link.springer.com/book/10.100...
"The Origin of the Term "Algebra" (Solomon Gandz)
www.jstor.org/stable/2299605
Videos:
"3. The Birth of Algebra" (Prof. Keith Devlin, Stanford)
• 3. The Birth of Algebra

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the music and its level in the background makes this video unwatchable

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