A and B in algebra stand for any variables of real numbers. A real number is a value of a continuous quantity that can represent a distance along a line. So if you see A and B in doing your algebra it is just a representation of a value that you need to find.
Puedes explicarlo mejor porfavor?
"ese libro" is "that book"
"este libro" is "this book"
"aquel libro" is also "that book"
"este libro" is the correct answer because it is stating that the book is near the person talking about that book.
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