Explanation:
I think writing the given out helps a bit.
x = small angle
2x+3 = large angle <-- it's 2x since it's twice the small angle and +3 because it's 3 degrees more than the small angle.
small angle + large angle = 180
Now just substitute!
Now that you know what x equals (aka the smaller angle) now you can find the larger angle.
Answer:
The smaller angle equals 59°
The larger angle equals 121°
Good luck!