F(-1)=-7x

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Solution for F(-1)=-7x equation: 



(-1)=-7F

We move all terms to the left:

(-1)-(-7F)=0

We add all the numbers together, and all the variables

-(-7F)-1=0

We get rid of parentheses

7F-1=0

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

7F=1

F=1/7

F=1/7

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