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Common Core Mathematics 6-8 
 ClusterAnalyze proportional relationships and use them to solve real-world and mathematical problems.
TopicRatios and Proportional Relationships
   Grade 7
  7.RP.2.c.Represent proportional relationships by equations. For example, if total cost t is proportional to the number n of items purchased at a constant price p, the relationship between the total cost and the number of items can be expressed as t = pn.