Question

What is the measure of angle 2z (pic in question)

Answer 1

z should be 63
the third angle is 180 - 168 ( adjacent angles on St line)
so the angle should be 12,
and the sum of triangle is 180,
so it should be 2z = 180 - 42 - 12
z should be 63

Answer 2

180 - 168 = 12

180 - 42 - 12 = 126
2z = 126