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3f+49-16f+4f=77-23f
We move all terms to the left:
3f+49-16f+4f-(77-23f)=0
We add all the numbers together, and all the variables
3f-16f+4f-(-23f+77)+49=0
We add all the numbers together, and all the variables
-9f-(-23f+77)+49=0
We get rid of parentheses
-9f+23f-77+49=0
We add all the numbers together, and all the variables
14f-28=0
We move all terms containing f to the left, all other terms to the right
14f=28
f=28/14
f=2
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