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8f-23=f+19
We move all terms to the left:
8f-23-(f+19)=0
We get rid of parentheses
8f-f-19-23=0
We add all the numbers together, and all the variables
7f-42=0
We move all terms containing f to the left, all other terms to the right
7f=42
f=42/7
f=6
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