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42=r/2+34
We move all terms to the left:
42-(r/2+34)=0
We get rid of parentheses
-r/2-34+42=0
We multiply all the terms by the denominator
-r-34*2+42*2=0
We add all the numbers together, and all the variables
-1r+16=0
We move all terms containing r to the left, all other terms to the right
-r=-16
r=-16/-1
r=+16
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