Question

please show that answer ​

Answer 1

Step-by-step explanation:

First arrange them.

-2a a+b. c+a

a+b -b+c. -2b

c+a -b+c -2c

——————————————

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

=-2a+2b+2c