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Sagot :
[tex] \: {y }^{2} + 5y - 7 \: subtract \: ({y}^{2} - 3y - 4n) \\ {y}^{2} + 5y - 7 - {y}^{2} + 3y + 4n \\ y {}^{2} - {y}^{2} + 5y + 3y + 4n - 7 \\ 8y + 4n - 7[/tex]
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