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4(x + 3) = 2(2x - 3) + 2(x + 1)
4x + 12 = 4x - 6 + 2x + 2
4x + 12 = 6x - 4
-2x = -16
x = 8
Panjang sisi persegi = x + 3 = 8 + 3 = 11 cm