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

x−4z+8y=7  8×+7z−y=4  x^2 +y^2 −z^2 =?

$${x}−\mathrm{4}{z}+\mathrm{8}{y}=\mathrm{7} \\ $$$$\mathrm{8}×+\mathrm{7}{z}−{y}=\mathrm{4} \\ $$$${x}^{\mathrm{2}} +{y}^{\mathrm{2}} −{z}^{\mathrm{2}} =? \\ $$

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