Answer:
x=20
Step-by-step explanation:
To find x use the fact that all triangle's angles sum to 180. This means that if you add all of the angles together, they will always equal 180 degrees. So, create an equation to represent this.
2x+65+75=180
2x+140=180
2x=40
x=20
This means that the missing angle is 40 degrees.