Math

A chemist needs 22 liters of a 14% acid solution. He has a 10​% solution and a 20% solution available to form the mixture. How much of each should be used to form the 14​% ​solution?

I'm having a really hard time forming an equation for this. I've tried creating a system for elimination, but that doesn't work--nor does substitution.

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  1. He is supposed to need 2 liters, not 22! Sorry for the typo

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