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2r=9r+5
We move all terms to the left:
2r-(9r+5)=0
We get rid of parentheses
2r-9r-5=0
We add all the numbers together, and all the variables
-7r-5=0
We move all terms containing r to the left, all other terms to the right
-7r=5
r=5/-7
r=-5/7
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