Introducción a Álgebra I - Introduction to Algebra I

Syntax: http://www.wccusd.net/cms/lib03/CA01001466/Centricity/domain/60/general%20mathematics%20resources/SyntaxV7.pdf

Representation: http://www.wccusd.net/cms/lib03/CA01001466/Centricity/domain/60/lessons/grade%207%20lessons/OneStepEquationsV4.pdf