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2014-11-17T20:20:30+02:00
A+b+c=122
(a+b):c=4 rest 7=>a+b=4c+7
c=b+18

a+b+c=122
4c+7+c=122
5c+7=122/-7
5c=115/:5
c=23

b+18=c
b+18=23/-18
b=5
a=94