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

-2F-12=0

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

-2F=12

F=12/-2

F=-6

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