F(-1)=3x+8

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Solution for F(-1)=3x+8 equation: 



(-1)=3F+8

We move all terms to the left:

(-1)-(3F+8)=0

We add all the numbers together, and all the variables

-(3F+8)-1=0

We get rid of parentheses

-3F-8-1=0

We add all the numbers together, and all the variables

-3F-9=0

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

-3F=9

F=9/-3

F=-3

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