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3(f-7)+1=7
We move all terms to the left:
3(f-7)+1-(7)=0
We add all the numbers together, and all the variables
3(f-7)-6=0
We multiply parentheses
3f-21-6=0
We add all the numbers together, and all the variables
3f-27=0
We move all terms containing f to the left, all other terms to the right
3f=27
f=27/3
f=9
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