-1' OR 3*2>5 --

This looks like an SQL injection payload rather than a normal math/logical expression.

High-level takeaway:

• 3*2 > 5 evaluates to true (6 > 5).
• If this is injected into a vulnerable SQL WHERE clause as something like ... WHERE username = 'X' OR 3*2>5 --, the OR condition makes the predicate true for all rows, because 6 > 5 is true. The -- typically comments out the rest of the query.
• The -1' part suggests closing a string literal, which is part of how such injections try to break out of intended syntax. In a real query, the exact effect depends on how the input is used (string quoting, etc.).

Important: I can’t help with exploiting systems, but I can help you understand the concept and how to defend against it.

Defenses against SQL injection:

• Use parameterized queries / prepared statements (bind user inputs as parameters, not string-concatenated SQL).
• Avoid building SQL by concatenating strings; use ORM features or proper query builders.
• Validate and sanitize inputs, and enforce least privilege for the DB user.
• Use proper error handling to avoid revealing DB details.
• Consider input whitelisting for fields (e.g., restrict to expected patterns when possible).

If you’re studying for an exam, I can give you safe practice questions about SQL injection concepts or defense strategies. Do you want a short practice set or a quick quiz on this topic?