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panjang tanah baru = a +3
katakan lebar tanah = b,
lebar tanah baru = b -2
(a +3)(b -2) = 280
28 X 10 + 280
a +3 = 28
a = 28 -3
a = 25
b -2 = 10
b = 10 +2
b = 12
ukuran tanah mula-mula
= 25 X 12
= 300 m persegi