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2/x = 4/6
4x = 12
x= 3, czyli DE = 3
AB/AD=BC/DE
4/AD=2/3
2AD=12
AD=6
AB/BD=AC/CE
4/BD=6/3
6BD=12
BD=2
AB/BD=AS/ST
4/2=10/ST
4ST=20
ST=5