To solve this expression, we follow the order of operations (parentheses, exponents, multiplication and division from left to right, addition and subtraction from left to right).

First, we simplify within the parentheses:
249200 ÷ 700 = 356
356 + 29748 = 30004
16000 - 30004 = -14004

Next, we perform the remaining operations:
-14004 ÷ 2 = -7002
155350 ÷ 50 = 3107

Finally:
-7002 + 3107 = -3895

Therefore, the final result is -3895.