Your answer would be 34°.
This is because a triangle adds up to 180°.
So to find the missing side we work with what we do know.
We know that one side is 50° and the other side is 96°
To find our third side add up the two sides we do know so adding 96 and 50 together will get us 146.
Then we subtract 146 from 180° because 180° adds up to a triangle.
Subtract and you get an answer of 34°.
Have a great Day!