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-2r-9=10+7r-1
We move all terms to the left:
-2r-9-(10+7r-1)=0
We add all the numbers together, and all the variables
-2r-(7r+9)-9=0
We get rid of parentheses
-2r-7r-9-9=0
We add all the numbers together, and all the variables
-9r-18=0
We move all terms containing r to the left, all other terms to the right
-9r=18
r=18/-9
r=-2
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