1. The problem is to simplify the expression $\left(\right)dee$, which appears to be incomplete or incorrectly formatted. 2. Normally, parentheses enclose terms or expressions, but here the parentheses are empty, so there is nothing to simplify inside. 3. The term "dee" is not a standard mathematical expression; it might be a typo or incomplete. 4. Without additional context or correction, the expression cannot be simplified or evaluated further. 5. Please provide a complete and correctly formatted expression for assistance.