Consider the following premises. forall x_7: R_7(x_7) <-> S_7(x_7). w -> R_7(a_7). S_7(a_7) or w. Can we infer R_7(a_7) from them?
 From forall x_7: R_7(x_7) <-> S_7(x_7) we can infer R_7(a_7) <-> S_7(a_7). From R_7(a_7) <-> S_7(a_7) we can infer S_7(a_7) -> R_7(a_7). Finally, from S_7(a_7) -> R_7(a_7), w -> R_7(a_7), S_7(a_7) or w we can infer R_7(a_7). Therefore, the answer is yes.