x_(K)=(x_(E)+[red]3[/red]*x_(F))/1+[red]3[/red])
y_(K)=(y_(E)+[red]3[/red]*y_(F))/(1+[red]3[/red])
z_(K)=(z_(E)+[red]3[/red]*z_(F))/(1+[red]3[/red])
0=(-1+[red]3[/red]*x_(F))/1+[red]3[/red]) ⇒ 3*x_(F)=1 ⇒ x_(F)=1/3
0=(2+[red]3[/red]*y_(F))/(1+[red]3[/red]) ⇒ 3*y_(F)=-2 ⇒ y_(F)=-2/3
2=(4+[red]3[/red]*z_(F))/(1+[red]3[/red]) ⇒ 4+3*z_(F)=8 ⇒ z_(F)=4/3