Social Sciences, asked by ranjit9815316271, 5 months ago

give answ plz be fast

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Answered by as6371815

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$- {x}^{2} - 4z - (2 {x}^{2} + 3y - 7z) \\ = - {x}^{2} - 4z - 2 {x}^{2} - 3y + 7z \\ = - 3 {x}^{2} + 3z - 3y \:$

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