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56.52=6.28r
We move all terms to the left:
56.52-(6.28r)=0
We add all the numbers together, and all the variables
-(+6.28r)+56.52=0
We get rid of parentheses
-6.28r+56.52=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-56.52
r=-56.52/-6.28
r=+9
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