307777796774489-88665787556898+4556899

The expression you provided is: 307777796774489 - 88665787556898 + 4556899

To solve this expression, we can follow the standard rules of arithmetic, which state that we should perform the addition and subtraction operations in order from left to right.

First, let's perform the subtraction: 307777796774489 - 88665787556898 = 219111009217591

Next, we perform the addition: 219111009217591 + 4556899 = 219111013774490

Therefore, the solution to the expression is 219111013774490.