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-8r-2=-10r
We move all terms to the left:
-8r-2-(-10r)=0
We get rid of parentheses
-8r+10r-2=0
We add all the numbers together, and all the variables
2r-2=0
We move all terms containing r to the left, all other terms to the right
2r=2
r=2/2
r=1
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