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r+5=2r+7
We move all terms to the left:
r+5-(2r+7)=0
We get rid of parentheses
r-2r-7+5=0
We add all the numbers together, and all the variables
-1r-2=0
We move all terms containing r to the left, all other terms to the right
-r=2
r=2/-1
r=-2
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