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Buku = x
Pensil = y
x = 2y - 1500
3y + x = 7500
Masukkan x ke persamaan,
3y + x = 7500
3y + (2y - 1500) = 7500
5y - 1500 = 7500
5y = 7500 + 1500
5y = 9000
y = 9000/5
y =
Jadi, harga sebuah pensil adalah Rp 1.800