(n - 6)3 = (n - 6)2
=> (n - 6)3 - (n - 6)2 = 0
=> (n - 6)2.(n - 6 - 1) = 0
=> (n - 6)2.(n - 7) = 0
=> \(\orbr{\begin{cases}\left(x-6\right)^2=0\\x-7=0\end{cases}}\)=> \(\orbr{\begin{cases}x-6=0\\x=7\end{cases}}\)=> \(\orbr{\begin{cases}x=6\\x=7\end{cases}}\)
(n - 6)3 = (n - 6)2
=> (n - 6)3 - (n - 6)2 = 0
=> (n - 6)2.(n - 6 - 1) = 0
=> (n - 6)2.(n - 7) = 0
=> $$=> $$=>