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14f+28=7f-13
We move all terms to the left:
14f+28-(7f-13)=0
We get rid of parentheses
14f-7f+13+28=0
We add all the numbers together, and all the variables
7f+41=0
We move all terms containing f to the left, all other terms to the right
7f=-41
f=-41/7
f=-5+6/7
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