7) $$\frac{2}{3} \cdot \left(-\frac{9}{16}\right)$$

$$ \frac{2}{3} \cdot \left(-\frac{9}{16}\right) = -\frac{2 \cdot 9}{3 \cdot 16} = -\frac{18}{48} = -\frac{3}{8} $$ Ответ: $$\displaystyle -\frac{3}{8}$$