How Large Are the Angles?

[nycmath]

The second angle of a triangle equals the first angle. The third angle is 12 degrees larger than the first angle. How large are the angles?

Setup:

First angle = x

Second angle = First angle = x

Third angle = x + 12

Angle 1 + Angle 2 + Angle 3 = 180°

x + x + x + 12 = 180°

Is this the correct equation?

[Eigenvalue]

Yes, the angles of the isosceles triangle are 56,56, and 68