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2014-04-03T20:09:15+03:00
A=6b+1 =>    6b+1-b=416 =>>    5b=415 >>>> b=83  =>>>>a=416+83 =>>>a=499
1 5 1
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2014-04-03T20:12:06+03:00
A:b=6 rest 1⇒a= 6b+1
a-b=416
6b+1-b=416
5b+1=416
5b=416-1
5b=415
b=415:5
b=83
a=6*83+1
a=498+1
a=499