6. Find the angle

If \(l\) and \(m\) are parallel lines and \(t\) be the transversal line, then \(\angle a = 4x - 20^{\circ}\) and \(\angle b = 2x + 16^{\circ}\). Calculate the values of angles \(a\) and \(b\).

 

 

\(\angle a =\) \(^{\circ}\)

 

\(\angle b =\) \(^{\circ}\)