यदि \(\left[ {\begin{array}{*{20}{c}} {x - y}&z\\ {2x - y}&w \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} { - 1}&4\\ 0&5 \end{array}} \right]\) है, तो (x + y) का मान ज्ञात कीजिए। 

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