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2r=5r+12
We move all terms to the left:
2r-(5r+12)=0
We get rid of parentheses
2r-5r-12=0
We add all the numbers together, and all the variables
-3r-12=0
We move all terms containing r to the left, all other terms to the right
-3r=12
r=12/-3
r=-4
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