\[3 - 1,5x\]
\[x = 4:\]
\[3 - 1,5 \cdot 4 = 3 - 6 = 3.\]
\[x = - 2:\]
\[3 - 1,5 \cdot ( - 2) = 3 + 3 = 6\]
\[x = - \frac{1}{3}:\]
\[3 - 1,5 \cdot \left( - \frac{1}{3} \right) = 3 + \frac{15}{10} \cdot \frac{1}{3} =\]
\[= 3 + \frac{3 \cdot 1}{2 \cdot 3} = 3 + \frac{1}{2} = 3,5.\]
\[x = 0,8:\]
\[3 - 1,5 \cdot 0,8 = 3 - 1,2 = 1,8.\]