F(-3)=2x+9

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Solution for F(-3)=2x+9 equation: 



(-3)=2F+9

We move all terms to the left:

(-3)-(2F+9)=0

We add all the numbers together, and all the variables

-(2F+9)-3=0

We get rid of parentheses

-2F-9-3=0

We add all the numbers together, and all the variables

-2F-12=0

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

-2F=12

F=12/-2

F=-6

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