Question 638550
[7 0 4 |-13]
[0 1 -5 | 11]
[2 7 0 | 6] 


converts to


7x+0y+4z = -13
0x+1y-5z = 11
2x+7y+0z = 6


which simplifies to


7x+4z = -13
y-5z = 11
2x+7y = 6