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