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Buku = x
Pensil = y
x = 3y
2x + 5y = 7.700
2(3y) + 5y = 7.700
6y + 5y = 7.700
11y = 7.700
y = 700
5y = 5(700) = 3.500
Jadi, harga 5 pensil adalah Rp. 3.500,00
2b + 5 p = 7.700
2x3p + 5p = 7.700
6p + 5p = 7.700
11p = 7.700
p = 7.700:11
p = 700
5p = 5 x 700 = 3.500