f(3)=3(2x-9)

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Solution for f(3)=3(2x-9) equation: 



(3)=3(2F-9)

We move all terms to the left:

(3)-(3(2F-9))=0



We calculate terms in parentheses: -(3(2F-9)), so:

3(2F-9)

We multiply parentheses

6F-27

Back to the equation:

-(6F-27)



We get rid of parentheses

-6F+27+3=0

We add all the numbers together, and all the variables

-6F+30=0

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

-6F=-30

F=-30/-6

F=+5

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