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2(p + l) = Keliling persegi panjang
2(p+p-5) = 90
2(2p - 5) = 90
4p - 10 = 90
4p = 90 + 10
4p = 100
p = 100/4
p = 25
substitusikan nilai p=25
l= p-5
l= 25 - 5
l= 20