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82=4f+6
We move all terms to the left:
82-(4f+6)=0
We get rid of parentheses
-4f-6+82=0
We add all the numbers together, and all the variables
-4f+76=0
We move all terms containing f to the left, all other terms to the right
-4f=-76
f=-76/-4
f=+19
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