F(15)=2x+9

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Solution for F(15)=2x+9 equation: 



(15)=2F+9

We move all terms to the left:

(15)-(2F+9)=0

We get rid of parentheses

-2F-9+15=0

We add all the numbers together, and all the variables

-2F+6=0

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

-2F=-6

F=-6/-2

F=+3

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