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pensil = y
2x + 5y = 16.500
2(3y) + 5y = 16.500
6y + 5y = 16.500
11y = 16.500
y = 1500
Buku = 3y = 3(1500) = 4500
harga 4 pensil = 4y = 4(1500) = 6000
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