\[3t + 17 = 2 \cdot (5t - 5)\]
\[3t + 17 = 10t - 10\]
\[3t - 10t = - 10 - 17\]
\[- 7t = - 27\]
\[t = \frac{- 27}{- 7} = \frac{27}{7}\]
\[при\ t = 3\frac{6}{7}.\]