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P=2(L+W)
P=400
at least 400
P≥400
2(L+W)≥400
2(4x+3+x+37)≥400
2(5x+40)≥400
divide both sides by 2
5x+40≥200
minus 40 from both sides
5x≥160
divide both sides by 5
x≥32

any value that is 32 or greater

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