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10r-39=4r+33
We move all terms to the left:
10r-39-(4r+33)=0
We get rid of parentheses
10r-4r-33-39=0
We add all the numbers together, and all the variables
6r-72=0
We move all terms containing r to the left, all other terms to the right
6r=72
r=72/6
r=12
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