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3x - y = 8 +
3x - 9y = 24
3x - y = 8 -
-8y = 16
y = -2
* 3x - y = 8
3x - (-2) = 8
3x = 8 - 2
3x = 6
x = 2
x = 2
Jadi, x = 2 dan y = -2