F(x)=19-x

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



(F)=19-F

We move all terms to the left:

(F)-(19-F)=0

We add all the numbers together, and all the variables

F-(-1F+19)=0

We get rid of parentheses

F+1F-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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