F(-3)=2x^+5x-9

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Solution for F(-3)=2x^+5x-9 equation: 



(-3)=2F^+5F-9

We move all terms to the left:

(-3)-(2F^+5F-9)=0

We add all the numbers together, and all the variables

-(2F^+5F-9)-3=0

We get rid of parentheses

-2F^-5F+9-3=0

We add all the numbers together, and all the variables

-7F+6=0

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

-7F=-6

F=-6/-7

F=6/7

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