Answer:
8
Explanation:
The straight line is 180 degrees.
There are two angle along it, aside from the one we are trying to calculate. These angles are 90 degrees and 40 degrees. Subtract both of these numbers from 180.
We are left with 50 degrees for our last angle.
50 = 6x + 2
-2 -2
48 = 6x
÷6 ÷6
8 = x