After interchanging + and -, 8 and 7, which one of the following

After interchanging + and -, 8 and 7, which one of the following becomes correct ?

1. 7 x 8 + 6 - 9 = 25
2. 8 - 7 + 3 x 5 = 35
3. 6 + 8 x 2 - 7 = 0
4. 8 x 2 + 7 - 6 = 9

After changing '+' and '-' , 8 and 7 the appropriate equation is,
6 + 8 x 2 - 7 = 0
L.H.S. = 6 - 7 x 2 + 8
6 - 14 + 8
14 - 14 = 0 = R.H.S.