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54 = 2(2x+3 + x)
54 = 2 (3x+3)
54 = 6x + 6
54-6 = 6x
48 =6x
8 = x
L = p x l
L = (2x +3) . x
= (2.8 + 3) . 8
= 19 x 8
= 152 cm2