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8=10r+8-2r
We move all terms to the left:
8-(10r+8-2r)=0
We add all the numbers together, and all the variables
-(8r+8)+8=0
We get rid of parentheses
-8r-8+8=0
We add all the numbers together, and all the variables
-8r=0
r=0/-8
r=0
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