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jeruk = y
3x+5y=85.000 dikali 5
5x+7y=123.000 dikali 3
= 15x+25y=425.000
15x+21y=369.000
--------------------------- -
4y=56.000
y=14.000
3x+5y=85.000 dikali 7
5x+7y=123.000 dikali 5
= 21x+35y=595.000
25x+35y=615.000
--------------------------- -
-4x= - 20.000
x=5.000
jadi. 1 kg apel = 14.000 dan 1 kg jeruk = 5.000