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2x (Kaki ayam berjumlah dua ) + 4y =114
2x + 4y = 114
x + y = 40 (x 2) = 2x + 2y = 80
2x - 2x + 4y - 2y = 114 - 80
2y = 34
y = 17 , jadi banyak kambing adalah 17.