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2014-05-20T14:18:19+03:00
L=8+l
P=l+l+L+L=28
2l+2L=28 /:2
l+L=14
l+5+(L-3)=14
l+5+(8+l-3)=14
l+5+(5+l)=14
l+5+5+l=14
2l+10=14
2l=4
l=2

L=8+2
L=10

P initial=10+10+2+2=24
2 5 2