4x4 matricos sprendimas Gauso metodu

Gal galite pagelbeti...? :)))
2x+y+z+t=1
x+y+z+t=0
x+z+t=1
2x+y+z+2t=0

Pati isprendus, gaunu taip, jos sprendiniu nera. Paciai drasiau butu, jog kazkas patikrintumet... :D

Sprendinys: x=1; y=-1; z=1; t=-1