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y = apel
2x + y = 55.000 (x4)
3x + 4y = 145.000 (x1)
> 8x + 4y = 220.000
3x + 4y = 145.000 -
-------------------------------
5x = 75.000
x = 15.000
Jadi harga 1kg jeruk adalah Rp.15.000