1. The user requested a response with no numbers, only expressions or variables. 2. This means all mathematical expressions should be left in symbolic form without substituting any numeric values. 3. For example, instead of writing $2 + 3 = 5$, write $a + b$ or similar expressions without evaluating. 4. This approach is useful for general formulas, proofs, or when teaching algebraic manipulation. 5. If you have a specific problem, please provide it, and I will respond using only symbolic expressions without numbers.