F(-1)=-2x+5

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Solution for F(-1)=-2x+5 equation: 



(-1)=-2F+5

We move all terms to the left:

(-1)-(-2F+5)=0

We add all the numbers together, and all the variables

-(-2F+5)-1=0

We get rid of parentheses

2F-5-1=0

We add all the numbers together, and all the variables

2F-6=0

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

2F=6

F=6/2

F=3

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