F(n)=2n-9

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Solution for F(n)=2n-9 equation: 



(F)=2F-9

We move all terms to the left:

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

We get rid of parentheses

F-2F+9=0

We add all the numbers together, and all the variables

-1F+9=0

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

-F=-9

F=-9/-1

F=+9

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