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-2(r-8)=4
We move all terms to the left:
-2(r-8)-(4)=0
We multiply parentheses
-2r+16-4=0
We add all the numbers together, and all the variables
-2r+12=0
We move all terms containing r to the left, all other terms to the right
-2r=-12
r=-12/-2
r=+6
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