(3x – a)³ = 27x³ – 3·9x²·a + 3·3x·a² – a³ = 27x³ – 27ax² + 9a²x – a³
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(3x – a)³ = 27x³ – 3·9x²·a + 3·3x·a² – a³ = 27x³ – 27ax² + 9a²x – a³