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1+5r=3r+7
We move all terms to the left:
1+5r-(3r+7)=0
We get rid of parentheses
5r-3r-7+1=0
We add all the numbers together, and all the variables
2r-6=0
We move all terms containing r to the left, all other terms to the right
2r=6
r=6/2
r=3
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