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-f+2+4f=8-
We move all terms to the left:
-f+2+4f-(8-)=0
We add all the numbers together, and all the variables
-f+4f+2-0=0
We add all the numbers together, and all the variables
3f+2=0
We move all terms containing f to the left, all other terms to the right
3f=-2
f=-2/3
f=-2/3
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