Question

question is 3 a minus b + 4 that is in a bracket minus a minus b that is also another bracket its abstraction

Answer 1

=(3a-b+4)-(-a-b)
=4a+0b+4
=4a+4

Answer 2

3a - ( b + 4 ) - ( b )
_____________
opening brackets

3a - b - 4 - b

3a - 2b -4


OR IF IT IS
________
3a - (( b + 4 ) - b )
_____________
opening brackets

3a - b - 4 + b

3a - 4