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28000+3000r=36000+2000r=8
We move all terms to the left:
28000+3000r-(36000+2000r)=0
We add all the numbers together, and all the variables
3000r-(2000r+36000)+28000=0
We get rid of parentheses
3000r-2000r-36000+28000=0
We add all the numbers together, and all the variables
1000r-8000=0
We move all terms containing r to the left, all other terms to the right
1000r=8000
r=8000/1000
r=8
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