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differential pair with active load

Hello there. I´m havng some trouble understanding common mode level and differential pairs with acitve/mirror loads. So i was trying to solve this problem but I can´t seem to understand how to.
For question (a) all I got is that the impedance seen at node N is 1/gm3, and the current the flows thru that node would me Iss/2. Therefore, Vn=Iss/(2gm3).

Would some please explain me how to solve this problem
 

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