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615.14=2(3.14)r
We move all terms to the left:
615.14-(2(3.14)r)=0
We calculate terms in parentheses: -(2(3.14)r), so:We add all the numbers together, and all the variables
2(3.14)r
We multiply parentheses
6.28r
Back to the equation:
-(6.28r)
-(+6.28r)+615.14=0
We get rid of parentheses
-6.28r+615.14=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-615.14
r=-615.14/-6.28
r=97+3.020202020202/3.1717171717171
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