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13662.29=13000+13000r
We move all terms to the left:
13662.29-(13000+13000r)=0
We add all the numbers together, and all the variables
-(13000r+13000)+13662.29=0
We get rid of parentheses
-13000r-13000+13662.29=0
We add all the numbers together, and all the variables
-13000r+662.29=0
We move all terms containing r to the left, all other terms to the right
-13000r=-662.29
r=-662.29/-13000
r=289.2096069869/5676.8558951966
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