F(n)=21-3(n-1)

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Solution for F(n)=21-3(n-1) equation: 



(F)=21-3(F-1)

We move all terms to the left:

(F)-(21-3(F-1))=0



We calculate terms in parentheses: -(21-3(F-1)), so:

21-3(F-1)

determiningTheFunctionDomain
-3(F-1)+21

We multiply parentheses

-3F+3+21

We add all the numbers together, and all the variables

-3F+24

Back to the equation:

-(-3F+24)



We get rid of parentheses

F+3F-24=0

We add all the numbers together, and all the variables

4F-24=0

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

4F=24

F=24/4

F=6

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