Simplify the following expression: (Multiple Choice)

a + 2c - 5b - c + a - b

1. 2a - 6b + 2c

2. 2a - 6b + c

3. a - 6b + c

4. a - 5b + 2c

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Prime factor of 2080

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How to verify 15^3 - 4^3 - 11^3 using identities