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-2+r-8r=1-8r
We move all terms to the left:
-2+r-8r-(1-8r)=0
We add all the numbers together, and all the variables
r-8r-(-8r+1)-2=0
We add all the numbers together, and all the variables
-7r-(-8r+1)-2=0
We get rid of parentheses
-7r+8r-1-2=0
We add all the numbers together, and all the variables
r-3=0
We move all terms containing r to the left, all other terms to the right
r=3
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