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-6(2f+1)=78
We move all terms to the left:
-6(2f+1)-(78)=0
We multiply parentheses
-12f-6-78=0
We add all the numbers together, and all the variables
-12f-84=0
We move all terms containing f to the left, all other terms to the right
-12f=84
f=84/-12
f=-7
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