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x + 2y = 0
x = -2y
2x - 3y = 7
2(-2y) - 3y = 7
-4y - 3y = 7
-7y = 7
y = -1
x + 2y = 0
x - 2 = 0
x = 2
Jadi,
x = 2
y = -1