Eliminasi gauss jordan

24x1 + 12x2 - 8x3 + 16x4 + 4x5 = 28

8x1 + 24x2 + 20x4 + 16x5 = 20

16x1 + 44x2 + 32x4 + 32x5 = 28

4x1 + 12x2 + 8x3 + 4x4 + 4x5 = -8

Berapa x1, x2, x3, x4 dan x5?