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jeruk=y
5x+2y=32000 | x2 | 10x+4y=64000
3x+4y=36000 | x1 | 3x+4y=36000
disubstitusikan
10x+4y=64000
3x+4y=36000
-------------------- -
7x=28000
x=4000
12000+4y=36000
4y=24000
y=6000
jadi harga 1kg jeruk adalah Rp 6000,-