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((3x - 5) + (x + 3)) x 2 = 52
(3x - 5 + x + 3) x 2 = 52
(3x + x - 5 + 3) x 2 = 52
(4x - 2) x 2 = 52
4x - 2 = 52 : 2
4x - 2 = 26
4x = 26 + 2
4x = 28
x = 28/4
x = 7
Jadi,
p = 3x - 5 = 3 x 7 - 5 = 16 cm
l = x + 3 = 7 + 3 = 10 cm
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