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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