Question 6765
Well, let the angle be A. The supplement of angle A is (180 - A) degrees. The problem says that the measure of angle A is 24 degrees less than (180-A).
So we have: A = (180-A) - 24.  Solve for A

A = 180 - A - 24 Add A to both sides.
2A = 180 - 24
2A = 156 Divide both sides by 2.
A = 78 degrees.

A = (180-78)-24 
A = (102)-24
A = 78 degrees.

Check:

A = (180-A)-24
A = (180-78)-24
A = (102)-24
A = 78