Equation of matrices, solve for variables?

I want to solve for x, y, and If. The only unknowns.

    syms x y If;

    a=exp(-1i*2*pi/3);

    Vpost=[x+a^2*y; x+a*y; x+y];

    Zs=[j*0.1 0 0; 0; j*0.1, 0; 0, 0, j*0.3];

    I=[a*If; a^2*If; If];

    Vpre=[3; 0; 0];

solve this equation somehow for x, y, and If:

    Vpost = Zs*I+Vpre;

I can rearrange the equation by hand and plug in the values to get the answer. However, I'm trying to do it for a 6 variable system in the end.

Any help is appreciated. Thank you!