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2(2x-3) + 2(x+1) = Keliling persegi panjang = 4x-6 + 2x+2 = 6x-4
keliling persegi = keliling persegi panjang
4x+12 = 6x-4
-2x = -16
x = 8
sisi persegi = (x+3)
= 8 + 3
= 11 cm
Jadi sisi persegi adalah 11 cm