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104-20=8r+6r
We move all terms to the left:
104-20-(8r+6r)=0
We add all the numbers together, and all the variables
-(+14r)+104-20=0
We add all the numbers together, and all the variables
-(+14r)+84=0
We get rid of parentheses
-14r+84=0
We move all terms containing r to the left, all other terms to the right
-14r=-84
r=-84/-14
r=+6
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