Hello there! :D
Something important to remember:
All angles in a triangle equal 180 degrees.
1. 2x+2x+x=180
5x=180
x=36
2.
90 (right angle)+7x+3x= 180
90+10x=180
10x=90
x=9
3. x+x+2x=180
4x=180
x=45
You seem to have all the correct values, so good work!
I hope this helps!
~kaikers