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385=2*3.14r*r*r
We move all terms to the left:
385-(2*3.14r*r*r)=0
We add all the numbers together, and all the variables
-(+2*3.14r*r*r)+385=0
We get rid of parentheses
-2*3.14r*r*r+385=0
Wy multiply elements
-6r^3+385=0
We do not support erpression: r^3
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