F(-1)=2x

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Solution for F(-1)=2x equation: 



(-1)=2F

We move all terms to the left:

(-1)-(2F)=0

We add all the numbers together, and all the variables

-2F-1=0

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

-2F=1

F=1/-2

F=-1/2

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