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-12+6f+2f=6f+20
We move all terms to the left:
-12+6f+2f-(6f+20)=0
We add all the numbers together, and all the variables
8f-(6f+20)-12=0
We get rid of parentheses
8f-6f-20-12=0
We add all the numbers together, and all the variables
2f-32=0
We move all terms containing f to the left, all other terms to the right
2f=32
f=32/2
f=16
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