9+f=4(f-9)

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Solution for 9+f=4(f-9) equation: 



9+f=4(f-9)

We move all terms to the left:

9+f-(4(f-9))=0



We calculate terms in parentheses: -(4(f-9)), so:

4(f-9)

We multiply parentheses

4f-36

Back to the equation:

-(4f-36)



We get rid of parentheses

f-4f+36+9=0

We add all the numbers together, and all the variables

-3f+45=0

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

-3f=-45

f=-45/-3

f=+15

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