In the trapezoid , PQ || MN. Taking PN as transversal , we can say that QPN and MNP are supplementary angles.
[tex] = > 3x + 5 + 8x - 12 = 180[/tex]
[tex] = > 11x - 7 = 180[/tex]
[tex] = > 11x = 180 + 7 = 187[/tex]
[tex] = > x = \frac{187}{11} = 17[/tex]
