Question

-5+8-4+13-7+15

+2-9+12-5+4-16+1-3​

Answer 1

-5+8-4+13-7+15

3-4+13-7+15

-1+13-7+15

12-7+15

5+15

20

$----------------------------------$

+2-9+12-5+4-16+1-3​

-7+12-5+4-16+1-3

5-5+4-16+1-3

0+4-16+1-3

-12+1-3

-11-3

-14