[tex]\left[\begin{array}{ccc}6&3&1\\8&4&1\\n&-2&1\end{array}\right]=0[/tex] [tex]6*4*1+3*n*1+8*(-2)*1-1*4*n-6*(-2)*1-8*3*1=0 [/tex] [tex]24+3n-16-4n+12-24=0[/tex] [tex]3n-4n+\diagup\!\!\!\!\!24-16+12-\diagup\!\!\!\!\!24=0[/tex] [tex]3n-4n-16+12=0[/tex] [tex]-n-4=0[/tex] Keep the number on the left incognito and Put the number on the right without incognito by changing the sign. [tex]-n =4[/tex] simplify by (-1) [tex]\boxed{n = - 4}[/tex]
