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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+1-11=0
We add all the numbers together, and all the variables
3r-10=0
We move all terms containing r to the left, all other terms to the right
3r=10
r=10/3
r=3+1/3
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