<=>\(\left(x-3\right)\left[\left(x-3\right)^x-\left(x-3\right)^{10}\right]=0\)
<=>\(\orbr{\begin{cases}x-3=0\\\left(x-3\right)^x-\left(x-3\right)^{10}=0\end{cases}}\)
<=>\(\orbr{\begin{cases}x=3\\\left(x-3\right)^x=\left(x-3\right)^{10}\end{cases}}\)
<=>\(\orbr{\begin{cases}x=3\\x=10\end{cases}}\)
Vậy x={3 ; 10}