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3(r+4)-11=28
We move all terms to the left:
3(r+4)-11-(28)=0
We add all the numbers together, and all the variables
3(r+4)-39=0
We multiply parentheses
3r+12-39=0
We add all the numbers together, and all the variables
3r-27=0
We move all terms containing r to the left, all other terms to the right
3r=27
r=27/3
r=9
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