-3x - 12 > 0 <=> -3...12 <=> x...-4..

$$\begin{gathered} \mathrm{b}) -3\mathrm{x}-12>0\iff -3\mathrm{x}......12\iff \mathrm{x}......-4 \\ \mathrm{c})\frac{1-3\mathrm{x}}{2}<5\iff 1-3\mathrm{x}......10\iff -3\mathrm{x}.......9\iff \mathrm{x}......-3 \end{gathered}$$