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Common Core Mathematics 6-8 
 ClusterSolve real-life and mathematical problems using numerical and algebraic expressions and equations.
  
TopicExpressions and Equations
   Grade 7
  7.EE.4.b.Solve word problems leading to inequalities of the form px + q > r or px + q < r, where p, q, and r are specific rational numbers. Graph the solution set of the inequality and interpret it in the context of the problem. For example: As a salesperson, you are paid $50 per week plus $3 per sale. This week you want your pay to be at least $100. Write an inequality for the number of sales you need to make, and describe the solutions.