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x - y = 1
eliminasi y
2x + 2y = 6
2x - 2y = 2
4x = 8
x = 8/4
x = 2
eliminasi x
2x + 2y = 6
2x - 2y = 2
4y = 4
y = 4/4
y = 1
hp ( 2,1 )