how answer is 10?

Question

https://www.sololearn.com/post/485164/?ref=app

Answer 1

Nithish see..
b=--a

Means

b=--5
Then,
b=-(-5)
And,
b=5

So a+b gives 10

Answer 2

Please do not use google drive to present us your code. Copy code to playground and post it here. Thanks!