F(x)=31-9x

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Solution for F(x)=31-9x equation: 



(F)=31-9F

We move all terms to the left:

(F)-(31-9F)=0

We add all the numbers together, and all the variables

F-(-9F+31)=0

We get rid of parentheses

F+9F-31=0

We add all the numbers together, and all the variables

10F-31=0

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

10F=31

F=31/10

F=3+1/10

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