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pensil = p
b + p = 5.500
p = 5.500 - b
2b + 3p = 12.500
2b + 3(5.500 - b) = 12.500
2b + 16.500 - 3b = 12.500
-b = -4000
b = 4000
harga 4 buku
4b
4(4000)
= 16.000
jadi harga 4 buku adalah Rp.16.000