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40 = 2x + 2 (x + 4)
40 = 2x + 2x + 8
40 = 4x + 8
40 - 8 = 4x
32 = 4x
x = 32/4
x = 8
l = 8 cm
P = 8 + 4
= 12 cm
L = pl
L = 8 . 12
L = 96 cm²