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x + 3z = -2 | dikali 1 | x + 3z = -2
2y + z = 18 | dikali 3 | 6y - 3z = 54
------------------------------------------------- +
x + 6y = 52 ...... 4
* 1 dan 4 eliminasi
3x - y = 4 | dikali 6 | 18x - 6y =24
x + 6y = 52 | dikali 1 | x + 6y = 52
--------------------------------------------------- +
19x = 76
x = 4
y = 8
z = -2