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3.7 - 5
16
l = x + 3
7 + 3
10
52 = 3x - 5 + x + 3
52 - 3 + 5 = 4x
54 = 4x
x = 13,5
p = 3 . 13,5 -5 = 35,5cm
l = 13,5 + 3 = 16,5 cm