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(r+4)/4=4
We move all terms to the left:
(r+4)/4-(4)=0
We multiply all the terms by the denominator
(r+4)-4*4=0
We add all the numbers together, and all the variables
(r+4)-16=0
We get rid of parentheses
r+4-16=0
We add all the numbers together, and all the variables
r-12=0
We move all terms containing r to the left, all other terms to the right
r=12
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