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31=9r-5
We move all terms to the left:
31-(9r-5)=0
We get rid of parentheses
-9r+5+31=0
We add all the numbers together, and all the variables
-9r+36=0
We move all terms containing r to the left, all other terms to the right
-9r=-36
r=-36/-9
r=+4
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