F(-1)=-2x+7

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Solution for F(-1)=-2x+7 equation: 



(-1)=-2F+7

We move all terms to the left:

(-1)-(-2F+7)=0

We add all the numbers together, and all the variables

-(-2F+7)-1=0

We get rid of parentheses

2F-7-1=0

We add all the numbers together, and all the variables

2F-8=0

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

2F=8

F=8/2

F=4

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