Consider the following premises. R_7(e) -> t. t -> R_7(e). forall x_7: ~R_7(x_7). Can we infer t from them?
 From forall x_7: ~R_7(x_7) we can infer ~R_7(e). From t -> R_7(e), R_7(e) -> t we can infer t <-> R_7(e). Finally, from t <-> R_7(e), ~R_7(e) we can infer ~t, which contradicts t. Therefore, the answer is no.