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2(11r+7)+1=22r+15
We move all terms to the left:
2(11r+7)+1-(22r+15)=0
We multiply parentheses
22r-(22r+15)+14+1=0
We get rid of parentheses
22r-22r-15+14+1=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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