#### Answer

The first angle is 32 degrees.
The second angle is 64 degrees.
The third angle is 84 degrees.

#### Work Step by Step

The angles sum to 180 degrees.
2x+x+3(x-12)=180
6x=192
x=32
The first angle is 32 degrees.
The second angle is 64 degrees.
The third angle is 84 degrees.