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3f=16-f
We move all terms to the left:
3f-(16-f)=0
We add all the numbers together, and all the variables
3f-(-1f+16)=0
We get rid of parentheses
3f+1f-16=0
We add all the numbers together, and all the variables
4f-16=0
We move all terms containing f to the left, all other terms to the right
4f=16
f=16/4
f=4
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