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37=2r+23
We move all terms to the left:
37-(2r+23)=0
We get rid of parentheses
-2r-23+37=0
We add all the numbers together, and all the variables
-2r+14=0
We move all terms containing r to the left, all other terms to the right
-2r=-14
r=-14/-2
r=+7
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