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-33=-9-8r
We move all terms to the left:
-33-(-9-8r)=0
We add all the numbers together, and all the variables
-(-8r-9)-33=0
We get rid of parentheses
8r+9-33=0
We add all the numbers together, and all the variables
8r-24=0
We move all terms containing r to the left, all other terms to the right
8r=24
r=24/8
r=3
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