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-8(r+66)=16
We move all terms to the left:
-8(r+66)-(16)=0
We multiply parentheses
-8r-528-16=0
We add all the numbers together, and all the variables
-8r-544=0
We move all terms containing r to the left, all other terms to the right
-8r=544
r=544/-8
r=-68
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