F(3)=X+3y=12

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Solution for F(3)=X+3y=12 equation: 



(3)=F+3F=12

We move all terms to the left:

(3)-(F+3F)=0

We add all the numbers together, and all the variables

-(+4F)+3=0

We get rid of parentheses

-4F+3=0

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

-4F=-3

F=-3/-4

F=3/4

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