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2r-33=6r-69
We move all terms to the left:
2r-33-(6r-69)=0
We get rid of parentheses
2r-6r+69-33=0
We add all the numbers together, and all the variables
-4r+36=0
We move all terms containing r to the left, all other terms to the right
-4r=-36
r=-36/-4
r=+9
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