F(2)=f(2-1)-9

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Solution for F(2)=f(2-1)-9 equation: 



(2)=F(2-1)-9

We move all terms to the left:

(2)-(F(2-1)-9)=0

We add all the numbers together, and all the variables

-(F1-9)+2=0

We get rid of parentheses

-F1+9+2=0

We add all the numbers together, and all the variables

-1F+11=0

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

-F=-11

F=-11/-1

F=+11

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