How to set up a Pre algebra math problem?

Sup!

New member
I'm in college pre-algebra and I am stuck on this one.I have the answer below but how do you set up the problem?

You invest $6000 in two accounts paying 6% and 9% annual interest. At the end of the year, the accounts earn the same amount of interest.How much was invested at each rate?

The answer is $3600 at 6% and 2400 at 9%
 
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