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(7f-5)=28
We move all terms to the left:
(7f-5)-(28)=0
We get rid of parentheses
7f-5-28=0
We add all the numbers together, and all the variables
7f-33=0
We move all terms containing f to the left, all other terms to the right
7f=33
f=33/7
f=4+5/7
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