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Verified answer
L = p × l40 = 8 ( 2x - 3 )
40 = 16x - 24
40 + 24 = 16x
64 = 16x
x = 64/16
x = 4
Jadi, lebar tanah tersebut adalah...
( 2x - 3 ) = 2.4 - 3 = 8 - 3 = 5 cm
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