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r^2+10r=r^2+200
We move all terms to the left:
r^2+10r-(r^2+200)=0
We get rid of parentheses
r^2-r^2+10r-200=0
We add all the numbers together, and all the variables
10r-200=0
We move all terms containing r to the left, all other terms to the right
10r=200
r=200/10
r=20
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