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-8-8r=-10r
We move all terms to the left:
-8-8r-(-10r)=0
We get rid of parentheses
-8r+10r-8=0
We add all the numbers together, and all the variables
2r-8=0
We move all terms containing r to the left, all other terms to the right
2r=8
r=8/2
r=4
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