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x : ayam
y : itik
4x + 5y= 150.000 | x1 | 4x + 5y =150.000
3x + 5y=135.000 | x1 | 3x + 5y = 135000
----------------- -
1x = 15.000
x= 15.000
4 x 15.000 + 5y = 150.000
60.000 + 5y = 150.000
5y = 150.000 - 60.000
5y = 90.000
y = 180.000
harga 2 ekor ayam dan 4 ekor itik
2 x 15000 + 4 x 18000
30.000 + 72.000
102.000