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2014-06-07T21:07:44+03:00
A+b+c=750

a,b,c,  dp cu 4,7,14

a/4=b/7=c/14=k
a=4k
b=7k
c=14k

4k+7k+14k=750
25k=750
k=30

a=4*30=120
b=7*30=210
c=14*30=420
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