$\text{$√\dfrac{9}{25}$ - |x - $\dfrac{1}{2}$| = $\dfrac{2}{3}$}$
$\text{$\dfrac{3}{5}$ - |x - $\dfrac{1}{2}$| = $\dfrac{2}{3}$ }$
$\text{|x - $\dfrac{1}{2}$| = $\dfrac{3}{5}$ - $\dfrac{2}{3}$ }$
$\text{|x - $\dfrac{1}{2}$| = $\dfrac{-1}{15}$ }$
$\text{Vì |x - $\dfrac{1}{2}$| > 0}$
$\text{nên không có giá trị thỏa mãn |x - $\dfrac{1}{2}$| = $\dfrac{-1}{15}$ }$
$\text{⇒ x ∈ ∅}$