Pearson Algebra 1 Common Core, 2011
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Pearson Algebra 1 Common Core, 2011 View details
6. Systems of Linear Inequalities
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Exercise 47 Page 405

Pay close attention to the order of operations.

Practice makes perfect
According to the order of operations, expressions inside parentheses are evaluated first, while addition and subtraction are evaluated last. For the given expression this means evaluating the expression inside the parentheses completely first.