Masukan: 
[4.0, -4.0, 1.0, -3.0]
[1.0, -1.0, 1.0, 4.0]
[9.0, -6.0, 1.0, 4.0]
Nilai setiap variabel adalah: 
X1 = 3.888889
X2 = 6.222222
X3 = 6.333333
