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A steady stream of water flows into a partially-filled rectangular tank. After 6 minutes, there are 87 gallons of water in the tank. After 21...

A steady stream of water flows
into a partially-filled rectangular tank.
After 6 minutes, there are 87 gallons of
water in the tank. After 21 minutes,
there are 222 gallons. Write an equation
to represent the volume of water in the
tank y after x minutes. How much water
was in the tank to begin?

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