Respuesta :

Answer:

3a - b - c

Step-by-step explanation:

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

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

3a - b - c

Step-by-step explanation:

a-1[2b+{c-2a-b}]

or, a-1[2b+c-2a-b]

or, a-2b-c+2a+b

or, 3a-b+c