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x - y = 1
_________ -
2y = - 3
y = - 3/2
x = - 2 - 3/2 = - 7/2
X+ Y = -2
X- Y = 1 _
2y = -3
y = -3/2
Subtitusi y = -3/2
X+Y = -2
X - 3/2 = -2
2x -3 = -4
2x = -4+3
x = -1/2
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