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L = x + 8
K ?
K = 2(p+l)
64 = 2(2x+3+x+8)
64 = 2(3x + 11)
64 = 6x + 22
64 - 22 = 6x
42 = 6x
x = 42/6
x = 7
L = x + 8
= 7 + 8
= 15 cm