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2014-04-21T10:22:43+03:00
A+b+c=120
a=7k
b=6k
c=18k

7k+6k+18k=120
31k=120
k=120:31
k=3.87

a=7*3.87=27.09
b=6*3.87=23.22
c=18*3.87=69.66
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