F(x)=80-20x

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Solution for F(x)=80-20x equation: 



(F)=80-20F

We move all terms to the left:

(F)-(80-20F)=0

We add all the numbers together, and all the variables

F-(-20F+80)=0

We get rid of parentheses

F+20F-80=0

We add all the numbers together, and all the variables

21F-80=0

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

21F=80

F=80/21

F=3+17/21

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