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pensil = p
5b+2p = 30.000 (x2)
2b+4p = 20.000 (x1)
10b+4p = 60.000
2b+4p = 20.000
------------------- -
8b = 40.000
b = 40.000/8
b = 5.000
5b+2p = 30.000
5x5.000+2p = 30.000
25.000+2p = 30.000
2p = 30.000 - 25.000
p = 5.000/2
p = 2.500
6b+4p
6x5.000 + 4x2.500
30.000 + 10.000
40.000
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