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2014-05-12T19:10:42+03:00
A+b+c+d=232
a+x=36
b+x=48
c+x=83
d+x=101
...........................+
232+4x=268
4x=268-232
4x=36
x=9


a+9=36    a=27
b+9=48    b=39
c+9=83    c=74
d+9=101  d=92