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+2=0

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

2F=-2

F=-2/2

F=-1

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