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p= 5 + l
K= 2(p + l)
26= 2(5 + l + l)
26= 2(5 + 2l)
26= 10 + 4l
26 - 10= 4l
4l= 26 - 10
4l= 16
l= 16/4
l= 4
Jadi, lebar persegi panjang tersebut adalah 4 cm.