x−4z+8y=7 8×+7z−y=4 x^2 +y^2 −z^2 =?


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Question Number 155361 by Fikret last updated on 29/Sep/21

$x - 4 z + 8 y = 7$ $8 \times + 7 z - y = 4$ $x^{2} + y^{2} - z^{2} = ?$
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