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16=-2r-6r
We move all terms to the left:
16-(-2r-6r)=0
We add all the numbers together, and all the variables
-(-8r)+16=0
We get rid of parentheses
8r+16=0
We move all terms containing r to the left, all other terms to the right
8r=-16
r=-16/8
r=-2
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