Question: This happens if a PDE involves derivatives with respect to one variable only (or can be transformed to such a form), so that the other

This happens if a PDE involves derivatives with respect to one variable only (or can be transformed to such a form), so that the other variable(s) can be treated as parameter(s). Solve for u = u(x, y):

2uxx + 9ux + 4u = -3 cos x - 29 sin x

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