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a² = 3 - a
a³ = 3a - a² = 3a - (3 - a) = 4a - 3
a³ + 4a² + 9988 = 4a - 3 + 4(3 - a) + 9988
= 4a - 3 + 12 - 4a + 9988
= - 3 + 12 + 9988
= 9997