the equation system is as follows: I really can't solve it... which is a part of my summer project of the first PHD year.

Ax+B+Cy+Dyz=0

Ep+F+Gy+Hyq=0

I+Jz=y(K-Dx)

L+Mq=y(N-Hp)

Cx+Dxz+Gp+Hpq=R+Kz+Nq

x y z p q is the unknown variable, other capital form of letter are know parameter, I just want to get the representation form of the x y z p q, could you please help, thank you so much!