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6+10r=-1+9r
We move all terms to the left:
6+10r-(-1+9r)=0
We add all the numbers together, and all the variables
10r-(9r-1)+6=0
We get rid of parentheses
10r-9r+1+6=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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