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solve() drops variables from equation - why?

this is my worksheet: https://cocalc.com/share/f7766c5e-2f4d-4916-bb0d-74a7182e5fd5/2019-02-09-203517.sagews?viewer=share

In line 47 I solve for d_k. However the result does not contain p_ges nor U. That does not make sense to me, and makes me suspicious towards the result. What could have caused that? This equation describes a physical phenomenon, and it would not make sense for d_k to be independent of U or p_ges.