TeX source:

\begin{aligned} -5 v-5 & < -5(4 v+1) \\ -5 v-5 & < -20 v-5 \\ \underline {+20 v +20 v} \\ 15 v-5 & < -5 \\ \underline {+5 +5} \\ 15 v & < 0 \\ v & < 0 \end{aligned}