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2x + 24 + 2x + 4 = 400
4x + 28 = 400
4x = 372
x= 93 cm
p = (93+12) = 105
l = (93+2) = 95
400=2x(x+12+x+2)
400=2x(x+x+12+2)
400=2x(x+14)
400=2x+28
400-28=400=2
400/2
x=200
p=200+12=212
l=200=2=202