What does "q" mean? What does 1da,2db,3dc,4dd mean? You can easily check your own work by making a truth table, and verifying whether your reduction gives the same output as your original expression.
What is "x" in your logic equations? It does not show up in your K-maps. What is "U" is your K-maps? It does not show up in your logic equations. Where is your truth table?