can someone give me a formula for this please?
A college student earned $8400 during summer vacation working as a waiter in a popular restaurant. Part was invested at 8% simple interest and the remainder at 9% simple interest. At the end of one year, the student had earned $707 interest. How much was invested at 9%

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707=0.08(8400 +0.09(8400)

not possible

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