F(n)=4n-18

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Solution for F(n)=4n-18 equation: 



(F)=4F-18

We move all terms to the left:

(F)-(4F-18)=0

We get rid of parentheses

F-4F+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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