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Let the length be 2x+7 and the width be x:

2(length+width) = perimeter

2(2x+7+x) = 128

4x+14+2x = 128

4x+2x = 128-14

6x = 114

x = 19

Therefore: length = 45m and width = 19m

Check: 45+45+19+19 = 128m

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