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-7+4f=7-3f
We move all terms to the left:
-7+4f-(7-3f)=0
We add all the numbers together, and all the variables
4f-(-3f+7)-7=0
We get rid of parentheses
4f+3f-7-7=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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