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5+4r+3r=7r-3+8
We move all terms to the left:
5+4r+3r-(7r-3+8)=0
We add all the numbers together, and all the variables
4r+3r-(7r+5)+5=0
We add all the numbers together, and all the variables
7r-(7r+5)+5=0
We get rid of parentheses
7r-7r-5+5=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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