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3r-1=8-3
We move all terms to the left:
3r-1-(8-3)=0
We add all the numbers together, and all the variables
3r-1-5=0
We add all the numbers together, and all the variables
3r-6=0
We move all terms containing r to the left, all other terms to the right
3r=6
r=6/3
r=2
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