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36=3.14r+2r
We move all terms to the left:
36-(3.14r+2r)=0
We add all the numbers together, and all the variables
-(+5.14r)+36=0
We get rid of parentheses
-5.14r+36=0
We move all terms containing r to the left, all other terms to the right
-5.14r=-36
r=-36/-5.14
r=7+0.020000000000003/5.14
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