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From y² + 5 y - 7, subtract y² - 3 y - 4​
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From y² + 5 y - 7, subtract y² - 3 y - 4​

User Sampo Sarrala
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{y}^(2) + 5y - 7 - ( {y}^(2) - 3y - 4) \\ {y}^(2) + 5y - 7 - {y}^(2) + 3y + 4 \\ {y}^(2) - y {}^(2) + 5y + 3y - 7 + 4 \\ 8y - 3

User RKM
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