Answer:
Its actually really easy.
Y is = to 76 degree (Vertically Opposite Angle)
The same way x = z (Vertically Opposite Angles)
So as y = 76 and given angle also 76 we'll add them. You should get 152. Now we know x = z. And we also know angles around a point add up to 360. So 360 - 152 gives 208. Since there are two angles we'll divided them by 2. So you now have 104
Given angle : 76
Y : 76
X : 104
Z : 104
