Consider the following premises. forall x_17: R_17(x_17) -> S_17(x_17). p_8 -> R_17(a_17). S_17(a_17) <-> p_8. Can we infer p_8 -> S_17(a_17) from them?
 From forall x_17: R_17(x_17) -> S_17(x_17) we can infer R_17(a_17) -> S_17(a_17). Finally, from p_8 -> R_17(a_17), R_17(a_17) -> S_17(a_17) we can infer p_8 -> S_17(a_17). Therefore, the answer is yes.