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706.19=3.14r^2r=
We move all terms to the left:
706.19-(3.14r^2r)=0
We get rid of parentheses
-3.14r^2r+706.19=0
We move all terms containing r to the left, all other terms to the right
-3.14r^2r=-706.19
r=-706.19/1
r=-706.19
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