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12r-37=4r+35
We move all terms to the left:
12r-37-(4r+35)=0
We get rid of parentheses
12r-4r-35-37=0
We add all the numbers together, and all the variables
8r-72=0
We move all terms containing r to the left, all other terms to the right
8r=72
r=72/8
r=9
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