The values that are excluded are the values that will make the denominators of a fraction equal to 0.

In your case, we find the excluded values for the equation 

by solving

2x - 7 = 0 (since 2x - 7 is the denominator and we need to solve denominator = 0)

........

Click here to see the step by step solution for x

........

x = 7/2

So, the excluded value is 7/2.