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27=8r-5
We move all terms to the left:
27-(8r-5)=0
We get rid of parentheses
-8r+5+27=0
We add all the numbers together, and all the variables
-8r+32=0
We move all terms containing r to the left, all other terms to the right
-8r=-32
r=-32/-8
r=+4
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