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(2a^2 + 5a +7) - (a^2 - 3a - 1) =?

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2a^2 + 5a + 7 - a^2 + 3a + 1 = 2a^2 + (-a^2) + 5a + 3a + 7 + 1 = a^2 + 8a + 8