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2(1+2r)=
We move all terms to the left:
2(1+2r)-()=0
We add all the numbers together, and all the variables
2(2r+1)-()=0
We add all the numbers together, and all the variables
2(2r+1)=0
We multiply parentheses
4r+2=0
We move all terms containing r to the left, all other terms to the right
4r=-2
r=-2/4
r=-1/2
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