When we multiply an addition with a subtraction you will get subtraction
Eg: (-4) x 5 = -20, similarly, Bansuri was the -4 in Gunjan's life and Balwant was the 5, so as the product gunjan became -20.
When we multiply subtraction into subtraction we get addition.
Eg: (-3) x (-7) = 21, likewise, Bansuri was the -3 for Baldev and Balwant was -7, so Baldev became a positive 21.
Moral: MATHS does not stand for Mental Attack To Human Sense, it is Mash Attach To Human Senses
No offence to the subject.