How do i find x

Question

Answer 1

This solution to this is the same as a previous. Attempt to learn from the assistance provided.

Theorem

The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote angles.

99° = 67° + (5x - 8)°

Can you solve for x and answer?

Answer 2

x= 8 degrees

angles of the triangle sum to 180

5x-8 + 67 + (180-99) = 180

5x+59 -99 = 0

5x = 40

x = 8