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2014-08-09T12:23:54+03:00
(a+a+1+a+2):7=13 rest 5

3a+3=7*13+5

3a+3=91+5

3a=91+5-3

3a=91+2

3a=93

a=31

a+1=31+1=31
a+2=31+2=33
12 4 12