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-10=2r+8
We move all terms to the left:
-10-(2r+8)=0
We get rid of parentheses
-2r-8-10=0
We add all the numbers together, and all the variables
-2r-18=0
We move all terms containing r to the left, all other terms to the right
-2r=18
r=18/-2
r=-9
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