\[6xy\]
\[x = 7;\ \ y = 1,5:\]
\[6 \cdot 7 \cdot 1,5 = 63.\]
\[x = 1\frac{2}{3};\ y = - 1,4:\]
\[6 \cdot \left( \frac{5}{3} \right) \cdot \left( - \frac{7}{5} \right) = - \frac{6 \cdot 5 \cdot 7}{3 \cdot 5} = - 14.\]