### Home > MC1 > Chapter 7 > Lesson 7.2.4 > Problem 7-83

7-83.

Since *x* = 6 meters, the three pieces of lumber now look like this:

Can you find the total length of the lumber pieces?

Using the diagram above, can you write an expression to represent the pieces of lumber?

If 4 + *x* + *x* = 20, why must *x* + *x* = 16?

Can you find the value of *x*?