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The diagram shows two parallel lines, \( AB \parallel CD \parallel DE \), and a pair of intersecting lines that form two Z-shaped transversal angles.

We are asked to find the value of \( x \) for two sets of angles:
1. Angle \( \angle ABC = 2x \)
2. Angle \( \angle CDE = 8x \)

Given the Z-shape (which implies alternate interior angles), we know that:
- Alternate interior angles are equal when two parallel lines are cut by a transversal.

So, the angle \( \angle ABC \) and the angle \( \angle CDE \) are alternate interior angles, and therefore:
\[
2x = 8x
\]

Now, we can solve for \( x \):

\[
2x = 8x
\]
Subtract \( 2x \) from both sides:
\[
0 = 6x
\]
\[
x = 0
\]

Thus, the value of \( x \) is 0.

Would you like further explanation, or do you have any additional questions?

Here are 5 related questions:
1. How can we apply the concept of alternate interior angles in other geometric problems?
2. What other properties can we deduce from parallel lines and transversals?
3. Can you explain how to identify corresponding angles in similar diagrams?
4. What happens if the angles were supplementary instead of alternate?
5. How can we calculate angles when no variables are involved?

**Tip:** Remember, when dealing with parallel lines and transversals, look for alternate interior angles, corresponding angles, or supplementary angles to set up useful equations.

Find the value of x in the case of two parallel lines AB and CD intersected by transversal lines, where the angles are represented by 2x and 8x.

Find the value of x in a geometry problem involving parallel lines and transversals. This problem demonstrates the use of alternate interior angles to solve for x in cases of intersecting lines. Suitable for Grades 7-9.

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