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