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-4(2f+8)=-56
We move all terms to the left:
-4(2f+8)-(-56)=0
We add all the numbers together, and all the variables
-4(2f+8)+56=0
We multiply parentheses
-8f-32+56=0
We add all the numbers together, and all the variables
-8f+24=0
We move all terms containing f to the left, all other terms to the right
-8f=-24
f=-24/-8
f=+3
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