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2(r+7)=13
We move all terms to the left:
2(r+7)-(13)=0
We multiply parentheses
2r+14-13=0
We add all the numbers together, and all the variables
2r+1=0
We move all terms containing r to the left, all other terms to the right
2r=-1
r=-1/2
r=-1/2
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