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2014-07-10T20:52:00+03:00
1000 xa + 5 x100+ 10 xc +9= 3 x1000+ b x100+ 7 x10 +d

1000xa =3 x1000
a=3

5 x100=b x100
b=5

10 xc=7x10
c=7

d=9
2 5 2