clc
clear
disp "courtni. k"
a=[2 -3 5 4; 6 4 -2 7; 9 -5 8 -3; 11 7 3 6];

b=[18; 31; 27; 64];

x=a\b;

X=x(1)
y=x(2)
z=x(3)
w=x(4)

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