3x + 14 = 20 - 2x. what is x and how to solve it?

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

Can you me find the missing length. i attached an image.

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a