What is tosfos trying say with the words Ma'hie K"Ve'chomar Goffah
yerucham engel, long beach, USA
The words mean literally "from this self-same Kal v'Chomer." Tosfos is saying that Just as the Gemara wanted to learn that a woman can be divorced with Chalitzah through a Kal v'Chomer from Yevamah, so, too, we should be able to learn that an Amah Ivriyah could be set free with Chalitzah.
Dov Zupnik
but how does an AMoh Ha'avrieya get free with a GET.
The get is a Shtar Shichrur of an Eved.
D. Zupnik