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33=12r-3(9r)
We move all terms to the left:
33-(12r-3(9r))=0
We add all the numbers together, and all the variables
-(-27r)+33=0
We get rid of parentheses
27r+33=0
We move all terms containing r to the left, all other terms to the right
27r=-33
r=-33/27
r=-1+2/9
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