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(84-f)8=64
We move all terms to the left:
(84-f)8-(64)=0
We add all the numbers together, and all the variables
(-1f+84)8-64=0
We multiply parentheses
-8f+672-64=0
We add all the numbers together, and all the variables
-8f+608=0
We move all terms containing f to the left, all other terms to the right
-8f=-608
f=-608/-8
f=+76
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