F(-1)=-0.8x+2x

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Solution for F(-1)=-0.8x+2x equation: 



(-1)=-0.8F+2F

We move all terms to the left:

(-1)-(-0.8F+2F)=0

We add all the numbers together, and all the variables

-(+1.2F)+(-1)=0

We add all the numbers together, and all the variables

-(+1.2F)-1=0

We get rid of parentheses

-1.2F-1=0

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

-1.2F=1

F=1/-1.2

F=-1/1.2

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