Question

if a is -16 and b is -65 so (a-b)+(a+b)+(b+a-a)

Answer 1

(-16+65)+(-81)+ -65-16-16)
49-81 -81-16
-33- 81 -16
-114-16
- 130

Answer 2

a-b=-16-(-65)=65-16=49
a+b=-16-65=-81
b+a-a=b=-65
so, 49-81-65=-97