2f-(f-1)=9

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Solution for 2f-(f-1)=9 equation: 



2f-(f-1)=9

We move all terms to the left:

2f-(f-1)-(9)=0

We get rid of parentheses

2f-f+1-9=0

We add all the numbers together, and all the variables

f-8=0

We move all terms containing f to the left, all other terms to the right

f=8

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