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1 kaos = 20000
1 celana = 4x 20000 = 80000
4x + 3y = 380000
4(4y) + 3y = 380000
16y + 3y = 380000
19y = 380000
y = 20000
harga celana -> x = 4y maka x = 4(20000) = 800000