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23=3r-10
We move all terms to the left:
23-(3r-10)=0
We get rid of parentheses
-3r+10+23=0
We add all the numbers together, and all the variables
-3r+33=0
We move all terms containing r to the left, all other terms to the right
-3r=-33
r=-33/-3
r=+11
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