\(\left(x-3\right)^{30}=\left(x-3\right)^{10}\)
\(\Leftrightarrow\left(x-3\right)\left(x-2\right)\left(x-4\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=2\\x=4\end{matrix}\right.\)
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