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2014-01-18T19:37:55+02:00
D/i=9 rest 7
d=9i+7 
d-i=527
9i+7-i=527
8i=520
i=65
d=527+i
d=592


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2014-01-18T23:39:36+02:00
D= i*9+7 d= 9i+7 d-i = 527 d=527+i => 527+i = 9i+7 -i 
527= 8i+7 ⇒520:8 =65 d= 65×9+7 d= 592