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duku = b
diketahui a=3b
pers matematika
2a + 5b = 38500
2(3b) + 5b = 38500
6b + 5b = 38500
11b = 38500
b = 3500
substitusi niali b
2a + 5b = 38500
2a + 5(3500) = 38500
2a + 17500 = 38500
2a = 21000
a = 10500
maka harga anggur = 10500/kg, dan harga duku = 3500/kg