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-185=-10.7r-13.8
We move all terms to the left:
-185-(-10.7r-13.8)=0
We get rid of parentheses
10.7r+13.8-185=0
We add all the numbers together, and all the variables
10.7r-171.2=0
We move all terms containing r to the left, all other terms to the right
10.7r=171.2
r=171.2/10.7
r=16
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