In the diagram, g ∥ h, m∠1 = (4x + 36)°, and
m∠2 = (3x – 3)°.

Lines g and h are parallel and diagonal down to the right. A horizontal line cuts through lines g and h. Another vertical line goes through lines g and h and the horizontal line. At the intersection of the vertical line with line h, the bottom left angle is angle 1 and the bottom right angle is angle 3. At the intersection of the vertical line with line g, the uppercase left angle is angle 2.

What is the measure of ∠3?

21°
60°
120°
159