F(n)=12-3n

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Solution for F(n)=12-3n equation: 



(F)=12-3F

We move all terms to the left:

(F)-(12-3F)=0

We add all the numbers together, and all the variables

F-(-3F+12)=0

We get rid of parentheses

F+3F-12=0

We add all the numbers together, and all the variables

4F-12=0

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

4F=12

F=12/4

F=3

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