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2014-07-11T12:58:42+03:00
1000 xa+ 5 x100 +c x10 +9=3 x1000 +b x100 +7x10 +d

1000 xa= 3 x1000
a=3

5 x100=bx100
b=5

c x10=7 x10
c=7

d=9
3 4 3