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↔ (3x)³(-2y)⁰ + 3(3x)²(-2y)¹ + 3(3x)¹(-2y)² + (3x)⁰(-2y)³
↔ 27x³ - 54x²y + 36xy² - 8y³
a = 27
b = -54
c = 36
d = -8
↔ a + b + c + d
↔ 27 - 54 + 36 - 8
→ 1