Question

1. (6a + 5b + 4c) + (-6c + 15b) + (-8a)

Explanation:

Step1: Remove parentheses

$6a + 5b + 4c - 6c + 15b - 8a$

Step2: Group like terms

$(6a - 8a) + (5b + 15b) + (4c - 6c)$

Step3: Combine like terms

$(-2a) + (20b) + (-2c)$

Answer:

$-2a + 20b - 2c$