Mathematical Problem Solving with Verification

Solve this mathematical problem step-by-step, then verify your answer:

**Problem:**
{problem}

**Solution Process:**
1. **Solve**: Show your step-by-step solution
2. **Verify**: Check your answer by:
   - Substituting your answer back into the original problem
   - Checking if your steps follow mathematical rules
   - Verifying calculations are correct
   - Checking if answer makes logical sense
3. **Present**: Provide your verified answer with confidence

**Verification Steps:**
- Substitute answer back into original equation/problem
- Check each calculation step
- Verify units are correct (if applicable)
- Confirm answer is reasonable given context

After verification, present your final answer and indicate if you found any errors during verification.