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3x-y= -7
3x+3y = -9
3x-y= -7
Lalu tambahkan
Menjadi 4y = -2
Maka y = -1/2
Lalu cari x dengan cara
X + Y = -3
X+ (-1/2)= -3
X= -3 + 1/2
X = -2 1/4