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-r/3=11
We move all terms to the left:
-r/3-(11)=0
We multiply all the terms by the denominator
-r-11*3=0
We add all the numbers together, and all the variables
-1r-33=0
We move all terms containing r to the left, all other terms to the right
-r=33
r=33/-1
r=-33
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