F(-3)=2x

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



(-3)=2F

We move all terms to the left:

(-3)-(2F)=0

We add all the numbers together, and all the variables

-2F-3=0

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

-2F=3

F=3/-2

F=-1+1/2

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