Löse das lineare Gleichungssystem.


`{(14x,+,14y,+,2z,-,7w,=,-53),(12x,+,15y,+,2z,-,6w,=,-34),(6x,+,6y,+,z,-,3w,=,-23),(-42x,-,42y,-,6z,+,20w,=,154):}`

x =  
y =  
z =  
w =