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2014-08-09T11:00:38+03:00
A+b=5(a-b)

a:b=1 rest 3
a=b+3

b+3+b= 5(b+3-b)

2b+3=  5* 3

2b+3= 15

2b=15-3

2b=12

b=6  =>a=6+3=9