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4(f+7)=2f
We move all terms to the left:
4(f+7)-(2f)=0
We add all the numbers together, and all the variables
-2f+4(f+7)=0
We multiply parentheses
-2f+4f+28=0
We add all the numbers together, and all the variables
2f+28=0
We move all terms containing f to the left, all other terms to the right
2f=-28
f=-28/2
f=-14
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