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4s = 2p+2l
4s = 2(p+l)
4(x+3) = 2(2x-3+x+3)
4(x+3) = 2(3x)
4x+12 = 6x
2x = 12
x = 6
sisi persegi sebenarnya ialah x+3 = (6)+3 = 9 cm