\(\dfrac{x}{-5}=\dfrac{1}{30}-\dfrac{10}{25}\)
\(\Leftrightarrow\dfrac{x}{-5}=\dfrac{1}{30}-\dfrac{2}{5}\)
\(\Leftrightarrow\dfrac{x}{-5}=\dfrac{1}{30}-\dfrac{12}{30}\)
\(\Leftrightarrow\dfrac{x}{-5}=-\dfrac{11}{30}\)
\(\Leftrightarrow30x=55\)
\(\Leftrightarrow x=\dfrac{55}{30}=\dfrac{11}{6}\)