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5x -6y = -21
-2x +5y = 2z - 21
...
2x - y = - 7.........kali 6
5x - 6y =- 21..... kali i1
.
12x - 6y = - 42
5x - 6y = - 21
.......................(-)
7x = - 21
x = - 3
.
2x- y = - 7
y = 2x + 7
y = 2(-3) + 7
y = 1
-2x + 5y = 2 z - 21
-2(-3) + 5(1) = 2z - 21
6+5 + 21 = 2Z
32 = 2z
z = 16