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30=r/2+23
We move all terms to the left:
30-(r/2+23)=0
We get rid of parentheses
-r/2-23+30=0
We multiply all the terms by the denominator
-r-23*2+30*2=0
We add all the numbers together, and all the variables
-1r+14=0
We move all terms containing r to the left, all other terms to the right
-r=-14
r=-14/-1
r=+14
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