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3r+1=5r-3
We move all terms to the left:
3r+1-(5r-3)=0
We get rid of parentheses
3r-5r+3+1=0
We add all the numbers together, and all the variables
-2r+4=0
We move all terms containing r to the left, all other terms to the right
-2r=-4
r=-4/-2
r=+2
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