F(x)=80-15x

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Solution for F(x)=80-15x equation: 



(F)=80-15F

We move all terms to the left:

(F)-(80-15F)=0

We add all the numbers together, and all the variables

F-(-15F+80)=0

We get rid of parentheses

F+15F-80=0

We add all the numbers together, and all the variables

16F-80=0

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

16F=80

F=80/16

F=5

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