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hello students and welcome to lesson two of unit 4 in this lesson we are going to learn a strategy to help us solve two and multi-step equations our strategy is going to be called do undo and it is going to be the process of reversing the order of operations to solve equations our essential questions for today are one when I look at an algebraic expression how do I know what I would do first if I knew what the variable was and then second how can I reverse the order of operations to undo an equation to isolate the variable we are going to make be making a lot of connections to what weamp;#39;ve learned about expressions in unit 3 so I want you to think and recall a few things first what is the order of operations the order of operations is an agreed upon way to simplify expressions by simplifying first the grouping symbols second the exponents third multiplication and division and remember thatamp;#39;s from left to right and last addition and subtraction from left to right the other