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13=3f+1
We move all terms to the left:
13-(3f+1)=0
We get rid of parentheses
-3f-1+13=0
We add all the numbers together, and all the variables
-3f+12=0
We move all terms containing f to the left, all other terms to the right
-3f=-12
f=-12/-3
f=+4
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