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6r-1+6r=11.r
We move all terms to the left:
6r-1+6r-(11.r)=0
We add all the numbers together, and all the variables
6r+6r-(+11.r)-1=0
We add all the numbers together, and all the variables
12r-(+11.r)-1=0
We get rid of parentheses
12r-11.r-1=0
We add all the numbers together, and all the variables
r-1=0
We move all terms containing r to the left, all other terms to the right
r=1
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