Question

{(5-1).(7-1-7)}-(3-5).(7-9)

Answer 1

{4.(-1)}-(-2).(-2)
(-4)-(-2).(-2)
(-4)-(+4)
-4-4
-8

Answer 2

{(5-1).(7-1-7)}-(3-5).(7-9)
{ 4 x -1} - 2 x -2
- 4 + 4 = 0