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21+28f=35+21f
We move all terms to the left:
21+28f-(35+21f)=0
We add all the numbers together, and all the variables
28f-(21f+35)+21=0
We get rid of parentheses
28f-21f-35+21=0
We add all the numbers together, and all the variables
7f-14=0
We move all terms containing f to the left, all other terms to the right
7f=14
f=14/7
f=2
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