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2014-11-12T19:14:11+02:00
A+b=97
a/b=4(r=7)⇒a=4*b+7
a+b=97
4b+7+b=97
5b=90
b=18
a=4b+7
a=4*18+7
a=72+7
a=79
3 4 3