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11=12-3r
We move all terms to the left:
11-(12-3r)=0
We add all the numbers together, and all the variables
-(-3r+12)+11=0
We get rid of parentheses
3r-12+11=0
We add all the numbers together, and all the variables
3r-1=0
We move all terms containing r to the left, all other terms to the right
3r=1
r=1/3
r=1/3
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