Determine the value of \(x + y\) if\(\left[\begin{array}{cc}2 x+y & 4 x \\ 5 x-7 & 4 x\en...

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Determine the value of \(x + y\) if\(\left[\begin{array}{cc}2 x+y & 4 x \\ 5 x-7 & 4 x\en...
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