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8-f+13f=14f-20
We move all terms to the left:
8-f+13f-(14f-20)=0
We add all the numbers together, and all the variables
12f-(14f-20)+8=0
We get rid of parentheses
12f-14f+20+8=0
We add all the numbers together, and all the variables
-2f+28=0
We move all terms containing f to the left, all other terms to the right
-2f=-28
f=-28/-2
f=+14
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