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laptop = y
2x + 3y = 9.900.000
2x + 3(3x) = 9.900.00
2x + 9x = 9.900.000
11x = 9.900.000
x = 9.900.000/11
x = 900.000
Laptop = 3x = 3 x 900.000 = Rp. 2.700.000,00
Jadi harga sebuah laptop adalah Rp. 2.700.000,00