f=2(9-f)

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



f=2(9-f)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(2(-1f+9)), so:

2(-1f+9)

We multiply parentheses

-2f+18

Back to the equation:

-(-2f+18)



We get rid of parentheses

f+2f-18=0

We add all the numbers together, and all the variables

3f-18=0

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

3f=18

f=18/3

f=6

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