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2b + p = 25.000
2b + 2p = 30.000
2b + 2p = 30.000
2b + p = 25.000__-
p = 5.000
2b + p = 25.000
2b + 5.000 = 25.000
2b = 25.000 - 5.000
2b = 20.000
b = 20.000 / 2
b = 10.000
harga 3 buku = 3 * 10.000
= Rp 30.000,-