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y = -2
x+y = -1+-2 = -3
5x+y =-7. (×2)
3x+2y=-7
10x+2y=-14
______________ -
-7x=7
x=7/-7
=-1
3x+2y=-7
3(-1)+2y=-7
2y=-7+3
y=-4/2
y=-2
jadi
X+Y
-1+(-2)=-3