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12.3=r+6.72
We move all terms to the left:
12.3-(r+6.72)=0
We get rid of parentheses
-r-6.72+12.3=0
We add all the numbers together, and all the variables
-1r+5.58=0
We move all terms containing r to the left, all other terms to the right
-r=-5.58
r=-5.58/-1
r=5+0.58/1
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