12 months in a year x 7 = 84 You could write A x B = 84
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7 years x 12 months per year = 84 months
It would be 12y as in 12 times y.
The origins of algebra can be traced back to ancient mathmatics roughly 4 thousand years ago!
Pre-algebra is essentially the basics of algebra. Algebra can be tough for many, so as a way to break the ice, you (ussually) take a pre-algebra course before algebra itself. Algebra is a very large subject, spanning multiple years of courses in most (if not all) schools. After pre-algebra, you have to work with many algebraic equations in the later courses, which cannot be understood without learning the basics that are taught in pre-algebra.
There were no Muslims around 4000 years ago when the Babylonians began using what we now call algebra.