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6=r/2+3
We move all terms to the left:
6-(r/2+3)=0
We get rid of parentheses
-r/2-3+6=0
We multiply all the terms by the denominator
-r-3*2+6*2=0
We add all the numbers together, and all the variables
-1r+6=0
We move all terms containing r to the left, all other terms to the right
-r=-6
r=-6/-1
r=+6
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