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