Answer:
x = 4
Explanation:
Given m||n, the angles shown in the image are congruent angles, which means their measures are equal.
So we can write the following equation to find the value of x:
7x - 20 = 4x - 8
- Transfer like terms to the same side of the equation.
7x - 4x = 20 - 8
3x = 12
x = 4