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Can some one help me with my algebra i cant figure this out

A drilling company has a primary unit that can drill at a rate of 7 feet per hour. Because of an equipment failure, the workers must switch to a backup unit, which drills at a rate of 4 feet per hour. They must drill a hole 480 feet deep. Write an equation in standard form describing the process of drilling the hole. Let x represent the hours using the primary unit and y represent the hours using the secondary unit.

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I'm no expert but x+y over h for hours = 480 might work

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it did thank you for the help
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