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13=3f-5
We move all terms to the left:
13-(3f-5)=0
We get rid of parentheses
-3f+5+13=0
We add all the numbers together, and all the variables
-3f+18=0
We move all terms containing f to the left, all other terms to the right
-3f=-18
f=-18/-3
f=+6
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