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यदि $x+y=\left[\begin{array}{ll}2 & 1 \\ 1 & 2\end{array}\right]$ तथा $2 x-y=\left[\begin{array}{ll}1 & 2 \\ 2 & 1\end{array}\right]$ हो, तो x का मान ज्ञात कीजिए।