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2buku = 4pensil
3buku + 2pensil = 12000
3(2)pensil + 2pensil = 12000
6pensil +2pensil = 12000
8 pensil = 12000
pensil = 1500
3pensil = 3(1500)
= 4500
dit: 3p=?
jwb: 3b+2p= 12000. => (3x2)p+2p=12000. => 6p+2p=12000. => 8p=12000. => p=12000:8=1500 per pensil.
3p= 3x1500= 4500.
jadi harga 3 pensil= 4500.