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47.728=2(3.14)*r
We move all terms to the left:
47.728-(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)+47.728=0
We get rid of parentheses
-6.28r+47.728=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-47.728
r=-47.728/-6.28
r=7+1/1.6666666666667
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