\[ \begin{gathered} -30x+10<0\\ \qquad\qquad\quad -30x<-10\qquad (\phantom{{}}\times-1)\\ 30x>10\\ x>\frac{10:10}{30:10}\\ x>\frac{1}{3} \end{gathered} \]

\[ \bbox[#FFCCCC,10px] {V=\left.\phantom{{\frac{}{}}}\right]\;\frac{1}{3};+\infty\;\left[\phantom{{\frac{}{}}}\right.} \]