It is known that {x = 1, {y = 2, {z = 3, are the solutions of the equations {ax + by = 2, {by + CZ = 3, {CX + AZ = 7, and the value of a + B + C is obtained

It is known that {x = 1, {y = 2, {z = 3, are the solutions of the equations {ax + by = 2, {by + CZ = 3, {CX + AZ = 7, and the value of a + B + C is obtained

Taking x = 1, y = 2, z = 3 into the equation system, we get a + 2B = 2 -- (1) 2B + 3C = 3 -- (2) C + 3A = 7 -- (3) (1) + (2) + (3), we get 4 (a + B + C) = 12, so a + B + C = 3