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7x + 6y = 67.250 ⇒ ×1 ⇒ 7x + 6y = 67.250
2x + 3y = 25.000 ⇒ ×2 4x + 6y = 50.000
3x = 17.250
x = 5.750
Jadi, harga seekor ayam adalah Rp.5.750,-