F(-F(x))=x+19

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Solution for F(-F(x))=x+19 equation: 



(-(F))=F+19

We move all terms to the left:

(-(F))-(F+19)=0

We add all the numbers together, and all the variables

(-1F)-(F+19)=0

We get rid of parentheses

-1F-F-19=0

We add all the numbers together, and all the variables

-2F-19=0

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

-2F=19

F=19/-2

F=-9+1/2

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