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28.9=2(3.14)r
We move all terms to the left:
28.9-(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)+28.9=0
We get rid of parentheses
-6.28r+28.9=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-28.9
r=-28.9/-6.28
r=4+1/1.6613756613757
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