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2b + 3p = 67.500 --> kali 2 -->
4b + 6p = 135.000
5b + 6p = 150.000
------------------------- -
-b = -15.000
buku = 15.000
2b+3p= 67.500
30.000 + 3p = 67.500
3p = 37.500
p= 12.500
8buku = 8 x 15.000 = 120.000
2b + 3p = 67500
5b + 6p = 150000
4b + 6p = 135000
--------------------- -
b = 15000
8b = 8 x 15000 = 120000