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2014-10-07T18:10:41+03:00
A*b*c=2100
a=15
b=15+5=20
c=2100/15/20=7
2014-10-07T18:18:57+03:00
A*b*c=2100
a=15
b=15+5=20
15*20*c=2100
c=2100/300
c=7
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