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12=3r+6
We move all terms to the left:
12-(3r+6)=0
We get rid of parentheses
-3r-6+12=0
We add all the numbers together, and all the variables
-3r+6=0
We move all terms containing r to the left, all other terms to the right
-3r=-6
r=-6/-3
r=+2
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