F(-1)=-x-5

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Solution for F(-1)=-x-5 equation: 



(-1)=-F-5

We move all terms to the left:

(-1)-(-F-5)=0

We add all the numbers together, and all the variables

-(-1F-5)+(-1)=0

We add all the numbers together, and all the variables

-(-1F-5)-1=0

We get rid of parentheses

1F+5-1=0

We add all the numbers together, and all the variables

F+4=0

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

F=-4

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