Linus and Macy put the same amount of money into different investments for one year. Linus' investments increased by 8%. Macy's investments decreased by 7%. The difference in the value of their investments was $750 after the one year. What was the original amount of money that each invested?

How do I start to solve this?

Do I just substitute the known values into I=PRT and solve for P, or is there a different equation that is meant to be used.

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