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31=13-6f
We move all terms to the left:
31-(13-6f)=0
We add all the numbers together, and all the variables
-(-6f+13)+31=0
We get rid of parentheses
6f-13+31=0
We add all the numbers together, and all the variables
6f+18=0
We move all terms containing f to the left, all other terms to the right
6f=-18
f=-18/6
f=-3
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