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13f=16f+6
We move all terms to the left:
13f-(16f+6)=0
We get rid of parentheses
13f-16f-6=0
We add all the numbers together, and all the variables
-3f-6=0
We move all terms containing f to the left, all other terms to the right
-3f=6
f=6/-3
f=-2
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