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-11.7r=7.2r+13.23
We move all terms to the left:
-11.7r-(7.2r+13.23)=0
We get rid of parentheses
-11.7r-7.2r-13.23=0
We add all the numbers together, and all the variables
-18.9r-13.23=0
We move all terms containing r to the left, all other terms to the right
-18.9r=13.23
r=13.23/-18.9
r=-10.756097560976/15.365853658537
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