What would the angle next to the right angle with two angles 17,8

Organisms that live in the alpine and taiga biomes have developed unique adaptations that aid in their survival. the douglas-fir is a conifer tree that grows in the taiga biome. it has an average height of about 70 feet, and its wood is an important source of lumber.

What is the value of x in the diagram below?

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps