Question

-a-b subtracted from a+b​

Answer 1

a+b-(-a-b)

= a+b+a+b

= 2a+2b

= 2(a+b)

Answer 2

hola user here is your answer

$= a + b - ( - a - b) \\ = a + b + a + b \\ = 2 a+ 2b$

definitely this will help you