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10=33.14r*r
We move all terms to the left:
10-(33.14r*r)=0
We add all the numbers together, and all the variables
-(+33.14r*r)+10=0
We get rid of parentheses
-33.14r*r+10=0
We move all terms containing r to the left, all other terms to the right
-33.14r*r=-10
r=-10/1
r=-10
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