6x - 5y -2z = 2 4x + y + 3z = 10 5x + 3y + 7z = 13

6x - 5y - 2z = 2 ...(1)
4x + y + 3z = 10 ...(2)
5x + 3y + 7z = 13 ...(3)

(1) dan (2)
12x - 10y - 4z = 4
12x + 3y + 9z = 30
_______________ -
- 13y - 13z = - 26 ...(4)

(2) dan (3)
20x + 5y + 15z = 50
20x + 12y + 28z = 52
_________________ -
- 7y - 13z = -2 ...(5)

(4) dan (5)
- 13y - 13z = - 26
- 7y - 13z = -2
_____________ -
- 6y = - 24
y = 4

- 7(4) - 13z = - 2
-28 - 13z = - 2
- 26 = 13z
z = - 2

4x + 4 + 3(- 2) = 10
4x + 4 - 6 = 10
4x - 2 = 10
4x = 12
x = 3