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x + 2y = 3 (*2)
2x + y =9
2x + 4y = 6
5y = 15
y = 15/5
y = 3
2x + y = 9
2x + 3 = 9
2x = 9-3
x = 6/2
x =3
nilai x = 3 nilai y = 3
jadi (x,y) adalah (3,3)