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2014-09-25T19:36:01+03:00
a=11*n+3
 b=4*n+2
 (a+b):5 =(11n+3+4n+2):5=(15n+5):5= \frac{15n+5}{5} = \frac{5(3n+1)}{5} =3n+1
4 4 4