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8=2r+16
We move all terms to the left:
8-(2r+16)=0
We get rid of parentheses
-2r-16+8=0
We add all the numbers together, and all the variables
-2r-8=0
We move all terms containing r to the left, all other terms to the right
-2r=8
r=8/-2
r=-4
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