How to solve this very hard nonlinear ordinary differential equation: $4y^{3}+7x\sin(x)+4x^{4}-(16\cos(y)-7x-\frac{7}{4}y^{2})y'=-e^{y-x}+\sinh(y)$

Question

$4\cdot y^{3}+7\cdot x\cdot\sin(x)+4\cdot x^{4}-\left(16\cdot\cos(y)-7\cdot x-\frac{7}{4}\cdot y^{2}\right)\cdot y'=-e^{y-x}+\sinh(y)$

I tried a lot to solve this differential equation. I think it must have a strange integrator factor.