A 120-gallon tank initially contains 90 lbs of salt dissolved in 90 gallons of water. Brine containing 2 lb/gal of salt flows into the tank at a rate of 4 gal/min, and the well-stirred mixture flows out of the tank at the rate of 3 gal/min. Set up a differential equation for the amount, A, of salt in the tank after t-mintues. DO NOT SOLVE THE EQUATION, I just want to know that you can set it up.

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