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2(2r-4)=-52.
We move all terms to the left:
2(2r-4)-(-52.)=0
We add all the numbers together, and all the variables
2(2r-4)-(-52)=0
We add all the numbers together, and all the variables
2(2r-4)+52=0
We multiply parentheses
4r-8+52=0
We add all the numbers together, and all the variables
4r+44=0
We move all terms containing r to the left, all other terms to the right
4r=-44
r=-44/4
r=-11
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