Question

72-[15-(-3){4-7-3}]​

Answer 1

$72 - (15 +(3)( - 6))$

$= 72 - (15 -18) \\ = 72 + 3 \\ = 75$

Answer 2

=72-[15+3{-6}]
=72-[15-18]
=72-(-3)
=72+3
=75...
So,75 is the answer..