clc
clear
disp('Zhoria Renfus')

A = [3   2  -4   5;
     5  -6   7  -2;
     8   9   3   4;
    12  -5   6   7];

B = [20; -15; 73; 48]


answer = A \ B;

x = answer(1);
y = answer(2);
z = answer(3);
w = answer(4);

fprintf('x = %.4f\n', x)
fprintf('y = %.4f\n', y)
fprintf('z = %.4f\n', z)
fprintf('w = %.4f\n', w)