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Developing Essential Understanding of Expressions, Equations, and Functions for Teaching Math in Grades 6-8 John Fuller Virginity Lost offers a rareWhy do some equations have one solution, others two or even more solutions and some no solutions? Why do we sometimes need to ""switch"" the direction of an inequality symbol in solving an inequality? What could you say if a student described a function as an equation? How much do you know and how much do you need to know? Helping your students develop a robust understanding of expressions, equations and functions requires that you understand this