F(8)=3x-9

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Solution for F(8)=3x-9 equation: 



(8)=3F-9

We move all terms to the left:

(8)-(3F-9)=0

We get rid of parentheses

-3F+9+8=0

We add all the numbers together, and all the variables

-3F+17=0

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

-3F=-17

F=-17/-3

F=5+2/3

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