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12=2f+8
We move all terms to the left:
12-(2f+8)=0
We get rid of parentheses
-2f-8+12=0
We add all the numbers together, and all the variables
-2f+4=0
We move all terms containing f to the left, all other terms to the right
-2f=-4
f=-4/-2
f=+2
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