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2014-05-26T10:46:24+03:00
(105+b):5+12=790⇒(105+b):5=790-12⇒105+b=778*5⇒b=3890-105⇒b=3785
2014-05-26T10:48:12+03:00
  ( 525:5+b):5+12=790
(105+b):5=790-12
(105+b):5=778
105+b=778*5
105+b=3890
b=3890-105
b=3785
(105+b):5+12=790 (105+b):5=778 (105+b)=778*5=3890 (105+b)=3890 b=3890-105 b=3785