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telur itik = y
x + y = 30
700x + 800y = 22000 (bagi 100 kedua ruas)
7x + 8y = 220
7x + 8y = 220 | ×1
x + y = 30 | ×8
----------------------------
7x + 8y = 220
8x + 8y = 240 -
------------------------
-x = -20
x = 20
Jadi, byk telur ayam yang dibeli Amin adalah 20 butir