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p+l=54
p=l+6
54=l-l+6
2l=48
l=24cm
p=30cm
p-l = 6
p = 6+l
keliling = 2(p+l) = 108
2(6+l+l) = 108
2(6+2l) = 108
12+4l = 108
4l = 96
l = 24
p = 6+l
p = 6+24
p = 30