First, we know alternate interior angles are equal. So 24=2x and x = 12 degrees.
Substituting this in to the angle 7x (which is equal to y), we get y= 84 degrees.
We also see that 24 + y + x = 180 since it is along a straight line. So 24 + 84 + z = 180 and then z = 72 degrees.
