\(\left\{{}\begin{matrix}4P_M+2N_M+2P_X+N_X=116\\4P_M-2N_M+2P_X-N_X=36\\-P_M-N_M+P_X+N_X=9\\-2P_M-N_M+2P_X+N_X=14\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}P_X=16\\N_X=16\\P_M=11\\N_M=12\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}M:Na\\X:S\end{matrix}\right.\)\(M_2X:Na_2S\)