The angle that measures 95° and angle z are supplementary, then
m∠z + 95° = 180°
m∠z = 180° - 95°
m∠z = 85°
The angle that measures 95° and the angle that measures (5x + 15)° are vertical angles, then they are congruent.
5x + 15 = 95
5x = 95 - 15
x = 80/5
x = 16