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-2(r+3)=33
We move all terms to the left:
-2(r+3)-(33)=0
We multiply parentheses
-2r-6-33=0
We add all the numbers together, and all the variables
-2r-39=0
We move all terms containing r to the left, all other terms to the right
-2r=39
r=39/-2
r=-19+1/2
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