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42)
K = 2 (p+l)
60 = 2 (6x-5 +2x+3)
60 = 2(8x-2)
60 = 16x-4
64 = 16x
x = 4

P = 6x-5 = 6(4)-5 = 19cm

L = 2x+3 = 2(4)+3 = 11cm