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5+8r=13+4r
We move all terms to the left:
5+8r-(13+4r)=0
We add all the numbers together, and all the variables
8r-(4r+13)+5=0
We get rid of parentheses
8r-4r-13+5=0
We add all the numbers together, and all the variables
4r-8=0
We move all terms containing r to the left, all other terms to the right
4r=8
r=8/4
r=2
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