Question

I'll mark you brainliest​

Answer 1

Answer:

add a+b-3,b-a+3,a-b+3

⇒a+b−3+b−a+3+a−b+3

⇒a+b+3.

Answer 2

Answer:

2a

Step-by-step explanation:

(a+b-3)+(a-b+3)

= a+b-3+a-b+3

=2a [as (+3) & (-3) and (+b) & (-b) cancel each other]