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26r+13=12r+97
We move all terms to the left:
26r+13-(12r+97)=0
We get rid of parentheses
26r-12r-97+13=0
We add all the numbers together, and all the variables
14r-84=0
We move all terms containing r to the left, all other terms to the right
14r=84
r=84/14
r=6
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