A math problem ,can we reduce order of a PDE equation?

Question:A math problem ,can we reduce order of a PDE equation?

Posted: mehdi jafari 754 Product: Maple

June 15 2017

I have a question about order reduction of PDES, can we reduce order of a pde equation from 4 to 2?(or any book recommend fot this);any suggestions?

For example the equation below where A and Q and Ex are constant

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