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p = 3x - 5 = 3.6 - 5 = 13
l = 2x - 2 = 2.6 - 2 = 10
K = 2(p + l)
46 = 2 (3x - 5 + 2x - 2)
46 = 2 (5x - 7)
46 = 10x - 14
46 + 14 = 10x
60 = 10 x
6 = x
L = p . l
= 13 . 10
= 130