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20=2r+12
We move all terms to the left:
20-(2r+12)=0
We get rid of parentheses
-2r-12+20=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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