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pensil = x
2y + 4x = 7000
2(5x) + 4x = 7000
10x + 4x = 7000
14x = 7000
x = 7000/14
x = 500
Buku = 5x = 5(500) = 2500
b. 5y + 4x
= 5(2500) + 4(500)
= 12.500 + 2000
= Rp 14.500,00
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