-1 OR 5*5=26

Short answer: as written, the equation isn’t correct under standard meanings of OR.

• Compute 5*5 = 25.
• If OR is bitwise OR (as in programming languages): -1 | 25 = -1 (two’s complement), not 26.
• If OR is a logical OR on booleans: -1 is treated as true; 25 = 26 is false; true OR false = true, not 26.
• If you meant arithmetic, maybe you intended 5*5 - (-1) = 26.

If you can tell me what OR is supposed to mean in your context (bitwise, boolean logic, or something else), I can give a precise answer or help rephrase the problem. If you’re aiming for 26, the closest standard arithmetic form is 5*5 - (-1) = 26.