F(3)=-2x-1

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Solution for F(3)=-2x-1 equation: 



(3)=-2F-1

We move all terms to the left:

(3)-(-2F-1)=0

We get rid of parentheses

2F+1+3=0

We add all the numbers together, and all the variables

2F+4=0

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

2F=-4

F=-4/2

F=-2

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