Answer:

Step-by-step explanation:

-2a - [3x - {3c - (4y - 3x + 2a )}]​

-2a - [3x - {3c - 4y + 3x - 2a }]​

-2a - [3x - 3c + 4y - 3x + 2a ]​

-2a - [ - 3c + 4y + 2a ]​

-2a + 3c - 4y - 2a

- 4a + 3c - 4y