Linear equation help

ywdy

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Joined
Nov 14, 2006
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A house's furnace costs $259 a year to run. A new furnace costs $1225, but only $79 a year. How many years until the new furnace pays for itself?

I tried many ways of setting up the problem, but I feel that I'm leaving something out because the answer just doesn't look right. All I need is help setting up the problem.
 
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