F(-4)=3x+20

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Solution for F(-4)=3x+20 equation: 



(-4)=3F+20

We move all terms to the left:

(-4)-(3F+20)=0

We add all the numbers together, and all the variables

-(3F+20)-4=0

We get rid of parentheses

-3F-20-4=0

We add all the numbers together, and all the variables

-3F-24=0

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

-3F=24

F=24/-3

F=-8

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