258 + 336 + 249 - 785= 594 - 785= -191
Therefore, the result of the expression 258 - (-336) + 249 - 785 is -191.
258 + 336 + 249 - 785
= 594 - 785
= -191
Therefore, the result of the expression 258 - (-336) + 249 - 785 is -191.