F(15)=4x-9

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Solution for F(15)=4x-9 equation: 



(15)=4F-9

We move all terms to the left:

(15)-(4F-9)=0

We get rid of parentheses

-4F+9+15=0

We add all the numbers together, and all the variables

-4F+24=0

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

-4F=-24

F=-24/-4

F=+6

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