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x-y=5...pers.(2)
subtitusi pers.(1) ke pers.(2)
x-y=5
x-(-x+3)=5
x+x-3=5
2x=5+3
2x=8
x=8/2
x=4
subtitusi x=4 ke pers.(1)
y=-x+3
y=-4+3
y=-1