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(2f-1)-(6+f)=0
We add all the numbers together, and all the variables
(2f-1)-(f+6)=0
We get rid of parentheses
2f-f-1-6=0
We add all the numbers together, and all the variables
f-7=0
We move all terms containing f to the left, all other terms to the right
f=7
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