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-3(f-19)=6
We move all terms to the left:
-3(f-19)-(6)=0
We multiply parentheses
-3f+57-6=0
We add all the numbers together, and all the variables
-3f+51=0
We move all terms containing f to the left, all other terms to the right
-3f=-51
f=-51/-3
f=+17
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