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5b + 4p = 9.000
5b + 4p = 9.000
5b + p = 8.100 (dikurang)
3p = 900
p = 300
5b + p = 8.100
5b + 300 = 8100
5b = 7800
b = 1560
buku : Rp 1.560,00
pensil : Rp 300,00