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B=Buku
B+A=8
2B+A=11
______
B=3
3+A=8
A=8-3
A=5
5B+4A
5(3)+4(5)
15+20
=35
Jadi harga 5 buku dan 4 pensil adalah Rp35.000,00
2b + p = 11.000
~~~~~~~~~~~~~~ -
b = 3.000
p = 5.000
5b + 4p = 5(3.000) + 4(5.000) = 35.000