all triangles add up to 180°
so you know x-50°+95°+45° = 180°
this can be simplified to x - 50° + 140° = 180
you can then take away 140 from both sides leaving you with
x - 50° = 40°
you can then add 50° to both sides to get x = 90°
you can check this afterwards by doing
90 - 50 = 40
then 40 + 95 + 45 = 180
ANSWER = 90°