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2014-11-10T16:23:53+02:00
AC/AB=2/3
AB=AC+CB=AC+4
AB/AC=3/2
(AC+4)/AC=3/2
1+4/AC=3/2
4/AC=3/2-1=1/2
4/AC=1/2
AC=8 m
AB=AC+CB=8+4=12 m