7. a 2 + 5a + 6 by a + 2
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a ( a^2 + 5a + 6) +2 ( a^2 + 5a + 6)
a^3 + 5a^2 + 6a + 2a^2 + 5a + 12
a^3 + 7a^2 + 11a + 12 ( ans)
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