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2014-11-06T11:09:36+02:00
A:b=10 rest 3
a:c=5 rest 4
a+b+c=121
a=10c+5
b=5c+4
10c+5c+5+c+4
16c=121-9
16c =112
c=112:16
C=7
a=10x7+5
a=75
b=5x7+4
b=35+4
b=39