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