What is the measure of an angle that is 8 degrees less than 3 times its supplement?

Supplementary angles have a sum of 180 degrees.

If one angle is x, its supplementary angle is 180-x.

We are told that x is 8 less than triple its supplements so:

x=3 (180-x) - 8

x=540-3x-8

4x=532

x=133