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1/3x=1/2y
1/3x=1/2(7-2x)
1/3x=7/2-x
4/3x=7/2
x=7/2(3/4)
x=21/8=2 5/8
2x+y=7
2(21/8)+y=7
y=7-42/8
y=13/8=1 5/8
jadi (2 5/8, 1 5/8)