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