সমীকরণমালাঃ x + 2y - z = 5; 2x + 3y + z = 11; 3x - y + 3z = 7

Answer: 
x = 2, y = 2, z = 1
সমীকরণমালাঃ x + 2y - z = 5; 2x + 3y + z = 11; 3x - y + 3z = 7