Solving a fourth order non linear differential equation for explaining motion of a sausage in hot water.

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I am modelling the nonlinear behaviour of a sausage in hot water. I am trying to explain it's rotational, vibrational and translational motion in water with salt and subject to varying temperatures. I got the following equation. How do I solve the following equation analytically? $$x^2\frac{∂^4x}{∂y^4}+\frac32\frac{∂^2x}{∂y^2}+x\frac{∂x}{∂z}-\frac{Ax}{\frac{∂^3x}{∂z^3}}=B$$ Where $x=x(z,y)$ and $A$ and $B$ are constants. I would also appreciate if the graph is provided. $$x(0)= {e^3}$$