\[12 - 8x;если\ x = 4;\ - 2;0;\ \frac{3}{8}.\]
\[при\ x = 4:\ \]
\[12 - 8 \cdot 4 = 12 - 32 = - 20.\]
\[при\ x = - 2:\]
\[12 - 8 \cdot ( - 2) = 12 + 16 = 28.\]
\[при\ x = 0:\]
\[12 - 8 \cdot 0 = 12 - 0 = 12.\ \]
\[при\ x = \frac{3}{8}:\]
\[12 - 8 \cdot \frac{3}{8} = 12 - 3 = 9.\]