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706.5=3.14r^
We move all terms to the left:
706.5-(3.14r^)=0
We get rid of parentheses
-3.14r^+706.5=0
We add all the numbers together, and all the variables
-3.14r+706.5=0
We move all terms containing r to the left, all other terms to the right
-3.14r=-706.5
r=-706.5/-3.14
r=+225
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