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= 2 ( (21)(L) + (21)(15) + (L)(15) )
= 2 (21L + 315 + 15L)
= 2 (36L + 315)
= 72L + 630
72L + 630 = 1.206
72L = 1.206 - 630
72L = 576
L = 576 / 72
L = 8 dm