581 = 355

This appears to be an incomplete equation. However, based on the provided numbers, it is presented as \( 581 = 355 \), which is mathematically incorrect. If this were intended as a subtraction problem \( 581 - X = 355 \), then \( X = 581 - 355 = 226 \). If it were an addition problem \( X + 581 = 355 \), then \( X = 355 - 581 = -226 \). Without further context, the given statement is false.

Ответ: The equation as presented is incorrect.