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-97=3r-159
We move all terms to the left:
-97-(3r-159)=0
We get rid of parentheses
-3r+159-97=0
We add all the numbers together, and all the variables
-3r+62=0
We move all terms containing r to the left, all other terms to the right
-3r=-62
r=-62/-3
r=20+2/3
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