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-1+10r-2=9r-10
We move all terms to the left:
-1+10r-2-(9r-10)=0
We add all the numbers together, and all the variables
10r-(9r-10)-3=0
We get rid of parentheses
10r-9r+10-3=0
We add all the numbers together, and all the variables
r+7=0
We move all terms containing r to the left, all other terms to the right
r=-7
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