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7.16=2(3.14)(r)
We move all terms to the left:
7.16-(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)+7.16=0
We get rid of parentheses
-6.28r+7.16=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-7.16
r=-7.16/-6.28
r=1+0.88/6.28
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