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b= buku
p= pensil
ph= penghapus
b = 189 + p
b = 2 1/2 p
p = 2/3 ph
jawab :
b = b
189+p = 5/2p
189 = 5/2p-p
189 = 3/2p
p = 189 x 2/3 = 126 buah pensil
b = 189+126=315 buah buku
ph = 3/2 x 126 = 189 buah penghapus