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4s = 2 (p + l)
4 (x + 3) = 2 (2x - 3 + x + 1)
4x + 12 = 2 (3x - 2)
4x + 12 = 6x - 4
4x - 6x = -4 - 12
-2x = -16
x = -16 / -2
x = 8
Sisi Persegi = x + 3 = 8 + 3 = 11 cm