Subtract (3) from (4):

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• Subtract (2) from (3):
• \[ (27a + 9b + 3c + d) - (8a + 4b + 2c + d) = 40 - 15 \]
• \[ 19a + 5b + c = 25 \quad \text{(E2)} \]
• \[ (64a + 16b + 4c + d) - (27a + 9b + 3c + d) = 85 - 40 \]
• \[ 37a + 7b + c = 45 \quad \text{(E3)} \]
• Subtract E1 from E2:

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