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2014-08-08T14:36:38+03:00
A=11-3b

b+3a=17

b+3(11-3b)=17

b+33-9b=17

-8b +33=17

-8b= 17  -33

-8b= -16

8b=16

b=2

a=11- 3*2=  11-6= 5
2 4 2