We have the point $A(1,2,1)$ and the lines:
d1: $$x+2y-z+1 = 0 , x-y+z-1=0$$ d2: $$2x-y+z=0, x-y+z=0$$
Write the equation of the plane that passes through $A$ and is parallel to the two lines.
I'm really lost on this one. Got no clue whatsoever on what I have to do here.