Chapter 7 - Cumulative Review - Page 471: 10

$x=2$

The left side of the given inequality, $ \left| \dfrac{x}{2}-1 \right|\le0 ,$ will always give a non negative value. Hence, the solution above is only true when, $\dfrac{x}{2}-1=0.$ Multiplying both sides by $2$, then, \begin{array}{l}\require{cancel} x-2=0 \\\\ x=2 .\end{array}