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2b+3p=10.200
(dikurangi)
b+p=4.200
b=4.200-p
2(4.200-p)+3p=10.200
8.400-2p+3p=10.200
p=10.200-8.400
p=1.800(1pensil)
2b+3p=10.200
2b+3(1800)=10.200
2b+5400=10.200
2b=10.200-5.400
2b=4800
b=2400(1buku)
b+2p = 2400+2(1800)
=2400+3600
=6000