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x - y = -1
3x + 2y = -13
(yang atas dikali 3)
3x - 3y = -3
3x + 2y = -13
------------------- -
-5y = 10
y = -2
x - y = -1
x = -1 + y
x = -1 -2
= -3
3x+2y=-13
5x=-15
x=-3
3x-3y=-3
3x+2y=-13
-5y=10
y=-2