F(-3)=4x+9

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Solution for F(-3)=4x+9 equation: 



(-3)=4F+9

We move all terms to the left:

(-3)-(4F+9)=0

We add all the numbers together, and all the variables

-(4F+9)-3=0

We get rid of parentheses

-4F-9-3=0

We add all the numbers together, and all the variables

-4F-12=0

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

-4F=12

F=12/-4

F=-3

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