Докажите тождество: 10-9*(c-2/3)+7c-16=-2c.

\[10 - 9 \cdot \left( c - \frac{2}{3} \right) + 7c - 16 =\]

\[= - 2c\]

\[10 - 9c + 3 \cdot 2 + 7c - 16 = - 2c\]

\[10 - 9c + 6 + 7c - 16 = - 2c\ \]

\[- 2c = - 2c.\]