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5f+4=7f-4
We move all terms to the left:
5f+4-(7f-4)=0
We get rid of parentheses
5f-7f+4+4=0
We add all the numbers together, and all the variables
-2f+8=0
We move all terms containing f to the left, all other terms to the right
-2f=-8
f=-8/-2
f=+4
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