20. 2ab2c-2a + 3b3c - 3b - 4b2c2 + 40
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Step-by-step explanation:
2ab2c-2a + 3b3c - 3b - 4b2c2 + 4c
2ab2c – 2a + 3b3c – 3b – 4b2c2 + 4c
= 2a (b2c – 1) + 3b (b2c – 1) – 4c (b2c – 1)
= (b2c – 1) (2a + 3b – 4c)
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