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4200 m^2 → 42 dam^2
Kedelai = 42 - 8 - 20
= 14 dam^2
Jagung = 8 are
Kacang = 20
Kedelai = 4200 - 8 are - 20
= 4200 - 800 - 200
= 3200
jadi, luas tanah yang ditanami kedelai adalah 3200