The town of Leander must drain a local water tank by opening a valve and letting the water flow through a pipe into a nearby creek. The tank is currently at full capacity holding 34,440 gallons of water and the rate of flow of the water from the tank with the valve opened is 1640 gallons per hour. Write an equation to describe the draining of the water tank where y represents the volume in gallons of water remaining in the tank and x represents the number of hours that have passed since the valve was opened. Choose the domain and the range that would best apply to the situation.

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