\(\Leftrightarrow\dfrac{1}{6}-x=\dfrac{5}{3}\)
\(\Leftrightarrow x=\dfrac{1}{6}-\dfrac{5}{3}\)
\(\Leftrightarrow x=-\dfrac{3}{2}\)
\(\dfrac{1}{2}\times\dfrac{1}{3}-x=\dfrac{5}{3}\)
\(\dfrac{1}{6}-x=\dfrac{5}{3}\)
\(x=\dfrac{1}{6}-\dfrac{5}{3}\)
\(x=-\dfrac{3}{2}\)